COBALTOUS CHLORIDE--PROHIBITED

CAS: 7646-79-9

COBALTOUS CHLORIDE refers to cobalt(II) chloride, an inorganic cobalt salt identified by CAS 7646-79-9 used historically in chemical and industrial applications, and it is explicitly listed as a prohibited substance for use in food according to U.S. FDA food additive regulations due to lack of safe food use authorization.

What It Is

COBALTOUS CHLORIDE, identified by the CAS number 7646-79-9, refers to the chemical compound cobalt(II) chloride, a salt of cobalt and chlorine. This compound exists in various forms including anhydrous and hydrated crystal forms and is known by a number of synonyms including cobalt dichloride, cobaltous chloride, and dichlorocobalt. In inorganic chemistry, cobalt(II) chloride consists of one cobalt ion with a +2 oxidation state and two chloride ions, forming a crystalline solid that is soluble in water and many organic solvents. The chemical is typically encountered as a colored crystalline solid whose appearance can vary with hydration state, and it has been used historically in industrial, laboratory, and analytical contexts. Despite its chemical utility in non-food contexts, COBALTOUS CHLORIDE is not authorized as an additive or ingredient in foods, and regulatory inventories identify it specifically as a prohibited substance for direct incorporation into food products under U.S. food additive regulations. The designation "PROHIBITED" reflects that the compound does not have an established safe use in food processing or formulation, and its inclusion in food would be inconsistent with current regulatory standards.

How It Is Made

Cobalt(II) chloride is produced mainly by chemical synthesis routes that involve reacting a cobalt-containing source and hydrochloric acid under controlled conditions. In general inorganic chemical practice, cobalt metal, cobalt oxide, hydroxide, or carbonate can be dissolved in hydrochloric acid, and the resulting solution is filtered and concentrated until cobalt(II) chloride precipitates or crystallizes. The crystalline material can then be isolated and further dehydrated to produce anhydrous cobalt(II) chloride. Hydrated forms such as the hexahydrate can form under conditions where water molecules are integrated into the crystal lattice. The manufacturing process for research or industrial-grade cobalt(II) chloride typically occurs in controlled chemical facilities following standard laboratory or industrial chemical production protocols. These protocols focus on obtaining the desired purity and crystalline form appropriate for laboratory reagents or industrial uses. In industrial settings, additional purification steps such as recrystallization may be used to achieve higher purity or specific hydration states. The synthesis and handling of cobalt(II) chloride require appropriate safety and environmental controls because of the toxicological properties of the compound when not handled in accordance with chemical safety guidelines.

Why It Is Used In Food

Cobalt(II) chloride itself is not used in food or food products and has no authorized technological function within food formulations. In chemical and industrial contexts, cobalt salts such as cobalt(II) chloride have been used for non-food applications including humidity indicators, analytical reagents, catalysts in organic synthesis, and as precursors to other cobalt compounds. However, its chemical properties and potential health concerns have led food regulatory authorities to list this compound as prohibited for direct food use. Regulatory inventories such as those maintained by the U.S. Food and Drug Administration (FDA) identify substances that may or may not be included in foods; COBALTOUS CHLORIDE appears on the list of prohibited substances in food additive regulations, indicating that it does not have an accepted role as a food additive or processing agent. The lack of authorized use in food reflects an absence of demonstrated safe technological benefit in food systems and the presence of safer alternatives for technically similar purposes, such as colorants, pH indicators, or catalysts in industrial settings that are not part of food production.

Adi Example Calculation

Because no Acceptable Daily Intake (ADI) has been established for COBALTOUS CHLORIDE in the context of food additive regulation, it is not possible to provide an illustrative calculation of daily intake against an ADI for this compound. An ADI calculation typically involves comparing a scientifically derived health-based guidance value to an individual body weight to illustrate potential exposure relative to safety thresholds. In the absence of an established ADI for cobalt(II) chloride, such an example cannot be constructed. For authorized additives with established ADIs, a hypothetical calculation might present a comparison between daily intake from foods and the ADI expressed on a per kilogram body weight basis; however, this framework is not applicable to substances that are not permitted in food use due to their prohibited regulatory status.

Safety And Health Research

Cobalt(II) chloride is recognized in chemical and toxicological literature as a compound with toxicological properties at levels that would be considered relevant for human exposure from direct ingestion. While research on cobalt includes nutritional considerations relating to cobalt as an essential component of vitamin B12, the specific cobalt(II) chloride salt is not treated as a nutritional or safe food additive. Instead, toxicological studies focus on cellular effects and systemic exposure in experimental settings, and general chemical safety data highlight potential hazards associated with handling and exposure in occupational or laboratory contexts. Regulatory safety assessments prioritize ensuring that substances added to food are demonstrably safe under conditions of intended use. Because COBALTOUS CHLORIDE lacks authorization for food use and is specifically listed as prohibited in food additive regulations, any potential exposure via food would be considered inappropriate and inconsistent with regulatory safety standards. The prohibition reflects an absence of evidence supporting safe use in food and underscores that safety research has not established a basis for permitting direct addition to food products. Given its industrial and laboratory utility, safety data relevant to non-food applications may describe toxic effects in experimental models, but these findings are part of chemical hazard communication rather than evidence supporting food-related safety thresholds.

Regulatory Status Worldwide

In the United States, COBALTOUS CHLORIDE (cobalt(II) chloride, CAS 7646-79-9) is listed in the Substances Added to Food inventory maintained by the U.S. Food and Drug Administration (FDA) as a prohibited substance under 21 CFR Part 189.120, indicating that it is not authorized for use in food. This designation reflects that the compound has no recognized or approved technological function in food and has not been demonstrated to be safe for consumption or use in food systems. The FDA inventory provides regulatory context for substances that are actively prohibited from food use, and the citation of the corresponding CFR part underscores the formal regulatory basis for this status. Other major regulatory bodies such as the European Food Safety Authority (EFSA) and the Joint FAO/WHO Expert Committee on Food Additives (JECFA) do not list cobalt(II) chloride as an authorized food additive or permitted compound in their additive specifications, and there is no indication of an established acceptable daily intake or E-number for this compound. In international food additive databases, the absence of this compound from authorized lists further reinforces that it is not globally recognized as a permitted food ingredient. The compound’s regulatory status worldwide is characterized by prohibition in formal food additive regulations rather than allowance.

Taste And Functional Properties

Cobalt(II) chloride does not have a sensory profile that would be desirable or relevant for food products. In its solid form, the compound appears as colored crystals with no characteristic flavor intended for consumer products, and it is not designed to impart taste, texture, or aroma in a food context. In laboratory or industrial settings, cobalt(II) chloride can display color changes in response to hydration state, which historically has been exploited in humidity indicator strips where the compound changes color depending on moisture levels. These functional properties are tied to its crystal lattice interactions with water molecules rather than any gustatory attributes. Because cobalt(II) chloride is not used in food systems, information about its solubility or behavior in food matrices is not relevant for food formulation. In general chemical practice, the compound dissolves in water and various organic solvents, but the absence of an authorized food use means that it has no documented or validated impact on sensory quality or functional behavior in foods. The focus remains on its chemical properties relevant to laboratory and industrial applications rather than organoleptic properties in consumable products.

Acceptable Daily Intake Explained

An Acceptable Daily Intake (ADI) is a regulatory concept used to express the amount of a substance that can be ingested daily over a lifetime without appreciable health risk, based on expert toxicological evaluation. For authorized food additives, an ADI may be established by expert committees such as JECFA or EFSA following review of available data. However, because COBALTOUS CHLORIDE is not an authorized food additive and is instead designated as prohibited in food additive regulations, there is no established ADI for this compound. The absence of an ADI reflects that regulators have not identified conditions of safe food use or sufficient evidence to support a health-based guidance value for ingestion. In regulatory practice, when an ADI is not established for a compound, that compound should not be intentionally added to food. This distinction signals that the compound’s toxicity profile and lack of demonstrated safe performance in food contexts preclude defining a safe exposure level suitable for guiding food use. Therefore, there is no numeric ADI for cobalt(II) chloride in food, and any regulated exposure assessment must consider alternative frameworks appropriate for contaminants rather than authorized food ingredients.

Comparison With Similar Additives

In considering compounds related to metallic salts, those that are authorized as food additives often serve clearly defined technological functions with a supportive safety database, such as trace mineral salts used in animal nutrition under specific regulatory provisions, or cobalt derivatives that have nutritional roles when tightly controlled. In contrast, cobalt(II) chloride stands apart as a compound prohibited from direct food use because it lacks demonstrated safe performance and regulatory authorization. Other mineral-based additives permitted in food systems, such as certain magnesium or calcium salts, typically have established food-grade specifications, defined use conditions, and safety evaluations that support their technological role in foods. These sanctioned additives are subject to regulatory oversight with explicit conditions of use, whereas cobalt(II) chloride lacks such frameworks. Thus, the comparison underscores that compounds authorized for food use are backed by evidence and regulatory processes, while cobalt(II) chloride’s prohibited status reflects an absence of such validation.

Common Food Applications Narrative

Cobalt(II) chloride, known in regulatory listings as COBALTOUS CHLORIDE with CAS 7646-79-9, is not used or permitted as an ingredient or additive in food products. While cobalt compounds have been explored in food science contexts such as trace nutritional sources of cobalt in vitamin B12 or in research studies unrelated to direct food addition, the specific cobalt(II) chloride compound is listed on food additive regulatory inventories as a prohibited substance. Because it is prohibited, cobalt(II) chloride does not appear in conventional food ingredients lists, formulation guides for processed foods, or regulatory filings that describe permitted food additives. Instead, the compound's role related to food safety discussions lies in identifying it as a substance that should not be added to foods or beverages, with clear regulatory language noting its absence from authorized use lists. Consumers and food industry professionals will not find this compound in food packaging, ingredient statements, or food composition databases, and its mention in food regulatory contexts is specifically tied to prohibition and safety considerations rather than culinary application.

Safety & Regulations

FDA

  • Notes: Cobaltous chloride is specifically listed as a prohibited substance in FDA food additive regulations and therefore is not approved for food use.
  • Regulation: 21 CFR 189.120

EFSA

  • Notes: No applicable EFSA food additive authorization or ADI found.

JECFA

  • Notes: No JECFA food additive evaluation found for cobaltous chloride as a permitted additive.

Sources

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