TRISODIUM NITRILOTRIACETATE

CAS: 5064-31-3 BOILER WATER ADDITIVE

Trisodium nitrilotriacetate is a chelating boiler water additive permitted in food steam preparation under specific conditions in the US.

What It Is

Trisodium nitrilotriacetate is a chemical compound defined by the CAS number 5064-31-3 and identified as a boiler water additive. It belongs to the class of chelating agents and organic sodium salts that form stable complexes with metal ions. This compound appears as a white crystalline solid that is soluble in water and is used in industrial and controlled food processing contexts where treated steam may contact food. Its role in food-related regulatory frameworks is technical rather than nutritive, focusing on performance in equipment rather than contribution to the food itself. Trisodium nitrilotriacetate functions primarily by binding metal ions that can otherwise participate in unwanted reactions in aqueous systems. Chemically, it is derived from nitrilotriacetic acid neutralized with sodium, forming a trisodium salt that exhibits the characteristic chelating behavior of polycarboxylic chelants. In regulatory listings such as the FDA Substances Added to Food database, this compound is included with its CAS identifier and synonyms reflecting its chemical structure. The regulatory context acknowledges that this substance is not intended for direct addition to food ingredients but is permitted within a narrow functional category related to boiler water and steam generation systems in food processing. The nomenclature used reflects alternative names that arise from different naming conventions in chemical catalogs and safety data sheets. The compound is recognized internationally in chemical inventories and substance registries, and its identification includes structural representations and registry numbers across multiple databases. Understanding what this compound is also requires distinguishing it from free nitrilotriacetic acid. The latter is the parent acid form and has separate registry identifiers and regulatory considerations. The trisodium salt form, TRISODIUM NITRILOTRIACETATE, specified by the CAS number given in this document, represents the fully neutralized form used in aqueous systems where metal ion control is required. The compound’s usage in boiler water systems is grounded in its capacity to sequester hardness ions, thereby mitigating scale and corrosion in high-temperature environments.

How It Is Made

The manufacture of TRISODIUM NITRILOTRIACETATE typically involves a neutralization reaction between nitrilotriacetic acid and sodium hydroxide under controlled pH conditions. In a general industrial practice, nitrilotriacetic acid, a polycarboxylic acid, is dissolved in water and incrementally neutralized with sodium hydroxide solution. This neutralization continues until the pH indicates the formation of the trisodium salt. The resulting aqueous solution is then concentrated and crystallized to yield the solid chelating agent. The manufacturing process is industrial in scale and requires calibrated control of reactant addition, temperature, and agitation to ensure complete reaction and high purity of the trisodium salt. Purification steps in the production include removal of unreacted acid or sodium hydroxide, and often involve filtration and recrystallization techniques. The crystalline product is collected, washed, and dried to achieve the quality specifications suited for its intended industrial application. While detailed proprietary methods vary among producers, the underlying chemistry remains a stoichiometric acid-base reaction followed by standard solid product processing. The compound’s specifications for technical grade use, such as in boiler water treatment, typically include purity criteria that are established by chemical suppliers and, in specific regulatory frameworks, by reference to standard definitions. It is important to note that the production of TRISODIUM NITRILOTRIACETATE is not primarily aimed at food additive usage but at industrial performance. Nonetheless, when used in the food processing context, especially in boiler water systems where steam contacts food, the production standards must align with regulatory requirements to minimize contaminants. Manufacturers supplying to food-related applications often document their synthesis and quality control in technical data sheets and safety data sheets, which describe physical properties, purity metrics, and recommended handling. The synthesis pathway exemplifies common preparative methods for inorganic-organic salts derived from neutralizing a multi-acidic species with a strong base. Historical development of this class of chelating agents traces back to efforts to find alternatives to phosphate-based sequestrants in industrial applications, with subsequent adaptation in various domains including water treatment and cleaning formulations. The manufacturing methods continue to evolve with an emphasis on scalable, cost-efficient processes that maintain performance and safety standards.

Why It Is Used In Food

TRISODIUM NITRILOTRIACETATE is used in the context of food primarily as a boiler water additive. The rationale for its inclusion in regulatory frameworks stems from the need to control hardness and metal ions in boiler feedwater that generates steam in food processing facilities. In steam systems, dissolved metal ions such as calcium and magnesium can precipitate under heat, leading to scale build-up and corrosion in equipment. Chelating agents like TRISODIUM NITRILOTRIACETATE bind these ions, reducing their availability to form scale and thereby maintaining system efficiency and longevity. In food facilities, the steam generated from boiler systems can contact food products during processes such as blanching, cooking, and sterilization. Under such circumstances, regulatory authorities allow certain boiler water additives provided they meet stringent criteria and their use is limited to what is necessary for functional performance. The use of chelating agents in boiler water assists in maintaining steam quality, indirectly supporting consistent thermal processing without contributing directly to food composition. Regulatory sections such as 21 CFR 173.310 identify specific substances that may be safely used in the preparation of steam that contacts food, contingent upon adherence to prescribed conditions. The functional purpose of using a chelating boiler water additive in food operations is not to alter the sensory or nutritive properties of the food itself but to ensure the integrity of the processing environment. Boiler water treatment agents are selected for their ability to improve equipment performance and reduce downtime due to maintenance issues. In food manufacturing, reliability of steam generation systems is critical for process control and safety. Chelating agents like TRISODIUM NITRILOTRIACETATE contribute to these operational objectives, justifying their regulated use. Consequently, the use of such additives is highly controlled; they are categorized as secondary direct additives. The regulatory designation reflects that their presence in food is incidental to their technical function rather than intentional for nutritional or flavor purposes. Food processors incorporate boiler water treatment into their hazard analysis and critical control point (HACCP) plans to ensure that steam quality and treatment chemicals do not compromise food safety. When used within permitted bounds, these boiler water additives support consistent thermal processing while minimizing unintended impacts on food products.

Adi Example Calculation

Because TRISODIUM NITRILOTRIACETATE does not have an established Acceptable Daily Intake (ADI) due to its specific functional use as a boiler water additive, an illustrative ADI calculation is not directly applicable. ADI values are typically assigned for additives that are intentionally added to food and contribute to composition. In contrast, the regulatory allowance for this compound pertains to its technical role in boiler water treatment, and exposure to consumers from food processed with steam treated with this additive is incidental and not quantified in dietary intake assessments. However, to illustrate how ADI concepts work in general terms for additives that do have established ADIs, consider a hypothetical example: If a food additive has an ADI of X milligrams per kilogram of body weight per day, and a person weighs Y kilograms, the maximum amount of that additive considered safe for daily exposure would be X multiplied by Y. This framework helps regulators evaluate dietary exposure estimates against the ADI to determine whether typical consumption patterns pose any safety concerns. For TRISODIUM NITRILOTRIACETATE, such a calculation is not meaningful because an ADI has not been defined and its use is not associated with direct dietary exposure levels.

Safety And Health Research

Scientific and regulatory evaluations of TRISODIUM NITRILOTRIACETATE focus primarily on its hazardous properties in occupational and environmental contexts rather than nutritional effects. Toxicology data indicate that the compound can exhibit acute toxicity if ingested or inhaled at high levels, and appropriate safety precautions are advised in handling. Toxicology profiles from safety data resources note metrics such as lethal dose values in animal studies and potential irritation effects on skin and mucous membranes. These evaluations inform guidelines for safe handling and exposure control in industrial settings. Regulators and safety agencies assess such compounds for potential hazards including acute toxicity, skin and eye irritation, respiratory effects from dust inhalation, and possible long-term effects. Data from toxicological studies, such as oral lethal dose measurements in laboratory animals, contribute to hazard classification under systems like the Globally Harmonized System. While these classifications signal caution in handling, they do not directly translate to food safety risk at the low exposure levels associated with boiler water additives used within regulatory limits. Because TRISODIUM NITRILOTRIACETATE is not added directly to food as a flavoring or nutrient, its health impact through consumer exposure is expected to be minimal when used according to regulatory standards for steam generation. Risk assessments in this context consider not only the chemical’s intrinsic hazards but also the likelihood and magnitude of exposure through incidental contact. Regulatory frameworks such as 21 CFR 173.310 include provisions to ensure that use levels remain within bounds that do not compromise food safety. Independent scientific research into similar chelating agents has explored environmental and health endpoints. Studies often examine biodegradability, environmental fate, and comparative toxicity relative to other sequestrants. Findings generally indicate that such compounds can degrade under environmental conditions, although the specifics depend on the chemical structure and conditions. Research into occupational exposure emphasizes the importance of engineering controls, personal protective equipment, and training to mitigate risks for workers handling concentrated forms of the compound. These safety considerations align with broader industrial hygiene practices widely adopted in chemical and food processing industries.

Regulatory Status Worldwide

In the United States, TRISODIUM NITRILOTRIACETATE is recognized in the FDA Substances Added to Food inventory as a boiler water additive permitted under specific conditions outlined in 21 CFR 173.310. This section of the Code of Federal Regulations specifies that certain boiler water additives may be safely used in the preparation of steam that will contact food, provided their use is limited to that which is necessary for functional performance and the compounds are prepared from substances identified in the regulation. The inclusion of this compound in the regulatory listing reflects its acceptance for this narrow technical use case rather than as a direct food ingredient. The regulation sets forth parameters such as permissible concentrations and system conditions to ensure that steam used in food processing does not introduce unintended substances into food products. Regulatory frameworks outside the United States vary by jurisdiction. In Europe, comprehensive assessments of chemical safety for substances used in contact with food are governed by entities such as the European Food Safety Authority. However, TRISODIUM NITRILOTRIACETATE’s classification as a boiler water additive places it outside the typical list of direct food additives; specific approvals under European Union food additive lists such as E numbers are not documented for this compound. Consequently, its use in that context would be determined by local regulations for food processing aids and equipment-related substances. Internationally, chemical inventories maintained by countries and regions track the existence and permitted uses of chemical substances for industrial, research, and processing purposes. TRISODIUM NITRILOTRIACETATE is found in various inventories with associated identifiers but may not be universally permitted in food-related applications. Where permitted, its use is closely tied to functional categories rather than direct additive status. Regulatory authorities examine evidence related to safety, exposure potential, and functional need when determining allowable uses. Processors considering its use globally must consult local food safety regulations to determine whether boiler water additives with similar functions are permitted and under what conditions. In many cases, alternative boiler water treatment chemicals may be available with explicit regulatory guidance for food contact systems, and these alternatives are selected based on compliance with regional requirements.

Taste And Functional Properties

TRISODIUM NITRILOTRIACETATE itself does not contribute taste or flavor to food, as it is not added for sensory purposes. Its functional properties are rooted in chelation and sequestration of metal ions in water systems rather than interaction with food components. When dissolved in water, the compound dissociates to form sodium ions and the nitrilotriacetate anion, which can bind divalent metal ions such as calcium and magnesium. This behavior helps reduce the concentration of free metal ions, which might otherwise catalyze unwanted reactions or precipitate under high temperature conditions found in boiler systems. In practical applications, the presence of chelating agents in boiler water can influence the overall chemistry of the feedwater, potentially affecting pH and scale formation tendencies. However, because the compound is used in low concentrations as permitted under regulatory frameworks for boiler water additives, its direct functional effects on food chemistry are negligible. The compound serves a technical role, helping ensure stable operation of high-temperature equipment, which in turn supports consistent food processing conditions. From a sensory perspective, consumers would not detect TRISODIUM NITRILOTRIACETATE in food products because it is not intended to remain at appreciable levels in the final food. The regulatory controls for boiler water additives are designed to restrict residues to conditions that do not influence food characteristics. As a salt of nitrilotriacetic acid, its taste profile would be expected to be saline or slightly alkaline if encountered at sufficiently high levels, but such exposure is prevented by regulatory limits and system design. The functional behavior of chelating agents is often leveraged in other domains for water softening and stabilization of solutions where metal ions could interfere with desired reactions. In food processing equipment, these properties contribute to reduced scaling and corrosion, indirectly supporting product consistency. Users selecting boiler water additives consider factors such as solubility, stability over a range of pH levels, and compatibility with other treatment chemicals. TRISODIUM NITRILOTRIACETATE’s solubility and chelating strength make it suitable for applications where controlled metal ion binding is beneficial.

Acceptable Daily Intake Explained

The concept of Acceptable Daily Intake (ADI) is used by regulatory and scientific bodies to express a level of daily exposure to a substance that is not expected to pose a health risk over a lifetime. ADI values are typically derived from toxicological data gathered in controlled studies, incorporating conservative safety factors to account for uncertainties. For food additives that are intentionally added to food ingredients, ADI provides a benchmark for evaluating dietary exposure. In the case of TRISODIUM NITRILOTRIACETATE, ADI values are not established because the compound is not approved as a direct food additive that contributes to food composition. Instead, its permitted use is highly specific to boiler water systems where steam contacts food. Under these conditions, consumer exposure to the compound through food products is incidental and expected to be negligible when regulatory limits are observed. As such, regulatory texts do not assign an ADI for this compound in the way they do for conventional food additives. It is important to understand that ADI is not a recommended intake level for consumers, nor does it represent a threshold above which immediate health effects occur. Instead, ADI reflects a level of daily exposure that, based on current evidence and scientific judgment, is considered safe over a lifetime. When a compound has an ADI, regulatory bodies use it in risk assessment models to compare estimated exposure from food consumption against this benchmark. For substances without an assigned ADI due to their limited and incidental use, regulatory safety assessments focus on ensuring that any exposure through food processing aids remains well below levels of concern, often through design of processing systems and adherence to usage criteria.

Comparison With Similar Additives

Chelating agents encompass a range of compounds used to bind metal ions in various applications, including food processing and water treatment. TRISODIUM NITRILOTRIACETATE shares functional similarities with other sequestrants such as EDTA (ethylenediaminetetraacetic acid) and CITRIC ACID in that it can complex with divalent metal ions. EDTA salts are widely used in food formulations as stabilizers and preservative adjuncts because they help maintain color and texture by controlling metal-catalyzed oxidation reactions. In contrast, TRISODIUM NITRILOTRIACETATE’s role is centered on boiler water systems and not as a direct food ingredient. Citric acid, a naturally occurring organic acid found in citrus fruits, also exhibits metal-binding properties and conveys flavor as well as functional stability in foods. Unlike TRISODIUM NITRILOTRIACETATE, citric acid is used directly in formulations and has established ADI guidelines due to its intentional inclusion in consumer products. The distinction between these compounds underscores differences in regulatory treatment based on how and where they are used. Another related class of additives includes phosphates, which historically served as sequestrants and stabilizers in both industrial and food systems. Phosphate-based sequestrants control mineral behavior in aqueous solutions, similar to how chelating agents function in boiler water. However, phosphates are also directly used in food products for texture and moisture retention, necessitating specific regulatory definitions and intake limits. TRISODIUM NITRILOTRIACETATE’s use in boiler water illustrates a technical rather than compositional function. Comparing TRISODIUM NITRILOTRIACETATE to these other agents highlights how functional roles influence regulatory pathways. Deeper understanding of each compound’s interaction with metal ions and its application context informs decisions by food processors and regulators alike, ensuring that technical additives support equipment performance without compromising food safety.

Common Food Applications Narrative

Although TRISODIUM NITRILOTRIACETATE is not a flavoring or nutritional ingredient in foods, it plays a role in food processing environments involving steam generation. Steam is a ubiquitous utility in food manufacturing, used for blanching vegetables, cooking meats, sterilizing packaging, and driving thermal processes in the production of bakery items. Boiler water additives like TRISODIUM NITRILOTRIACETATE are incorporated into the formulation of feedwater to manage metal ions that contribute to scale and corrosion in boiler systems. Proper treatment of boiler water ensures that steam systems operate efficiently, reducing maintenance interruptions and preserving process temperatures that are critical for food safety and quality. In applications such as industrial kitchens, commercial canneries, and large-scale food processing plants, steam produced by boilers contacts food surfaces or is indirectly involved in heat transfer. For example, in the production of canned vegetables, steam heat treats food inside retorts; in the baking of breads and pastries, steam injection ovens improve crust texture and volume. The quality of steam can influence the uniformity of cooking and the reliability of temperature control. When boiler water additives are used within the bounds of regulatory sections such as 21 CFR 173.310, processors can maintain high-performance steam generation while ensuring that any incidental contact of treatment chemicals with food remains within safe and controlled limits. Other scenarios where treated steam is relevant include the pasteurization of dairy products and sterilization of bottles and containers. In such contexts, boiler water treatment is part of the broader sanitation and process control system. While end consumers do not see TRISODIUM NITRILOTRIACETATE listed on food labels, its presence in the processing chain supports the consistent quality of products such as steamed vegetables, packaged meats, baked goods, and beverage concentrates. The compound’s use is a behind-the-scenes technical measure, integrated into plant water treatment protocols rather than direct ingredient lists. Food processors often work with water treatment specialists to develop boiler water programs tailored to their specific equipment and feedwater chemistry. These programs account for the thermal demands of the production line, the source water hardness, and the compatibility of treatment chemicals with existing materials. TRISODIUM NITRILOTRIACETATE may be selected as part of these formulations based on its chelating properties and performance history in controlling metal ions. The end result supports efficient thermal processing that underpins a wide range of food products commonly encountered by consumers.

Safety & Regulations

FDA

  • Approved: True
  • Regulation: 21 CFR 173.310

EFSA

  • Notes: No EFSA direct approval found

JECFA

  • Notes: No JECFA evaluation identified

Sources

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