Mineral Acid – Definition, Effects and Health Risks
Mineral acids are inorganic acids such as sulfuric acid, hydrochloric acid, or nitric acid. They are used in industry and medicine but can cause severe chemical burns upon contact.
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Mineral acids are inorganic acids such as sulfuric acid, hydrochloric acid, or nitric acid. They are used in industry and medicine but can cause severe chemical burns upon contact.
What is a Mineral Acid?
Mineral acids (also called inorganic acids) are acids derived from inorganic compounds that do not contain a carbon backbone. They are among the strongest known acids and release hydrogen ions (H⁺) when dissolved in water. Common examples include sulfuric acid (H₂SO₄), hydrochloric acid (HCl), nitric acid (HNO₃), and phosphoric acid (H₃PO₄).
Properties and Chemical Basics
Mineral acids are characterized by a very low pH and are classified as strong acids because they dissociate almost completely in aqueous solution. This means they release nearly all of their hydrogen ions, resulting in a high proton concentration and correspondingly aggressive chemical reactivity.
- Sulfuric acid (H₂SO₄): One of the most important industrial chemicals worldwide; strongly corrosive and hygroscopic (water-attracting).
- Hydrochloric acid (HCl): Also occurs naturally in the human stomach (gastric acid) and is essential for digestion.
- Nitric acid (HNO₃): A powerful oxidizer; widely used in fertilizer production.
- Phosphoric acid (H₃PO₄): A moderately strong mineral acid; used in foods (e.g., cola drinks) and medicine.
Occurrence and Applications
Mineral acids play a key role in various sectors:
- Industry: Production of fertilizers, plastics, dyes, metal processing, and batteries.
- Medicine and pharmacy: Manufacture of drugs, pH regulation in infusion solutions, and gastric diagnostics.
- Food industry: Phosphoric acid as an acidulant (E338) in beverages; hydrochloric acid in the production of food additives.
- Laboratory medicine: Reagents for chemical analysis and diagnostics.
Medical Relevance and Health Risks
Mineral acids pose significant health risks to the human body. Contact with concentrated mineral acids can cause serious injury:
Corrosive Effects on Skin and Mucous Membranes
Strong mineral acids such as sulfuric acid or hydrochloric acid cause immediate chemical burns upon skin contact. The acid reacts with proteins and lipids in tissue, irreversibly destroying cells. Eyes, airways, and the digestive tract may also be affected.
Inhalation of Vapors
Inhaling acid vapors can lead to irritation of the respiratory tract, chemical burns in the lungs, and in severe cases, toxic pulmonary edema.
Ingestion
Accidental ingestion of mineral acids is a medical emergency. Severe chemical burns to the mouth, esophagus, and stomach can result in life-threatening complications such as perforation.
First Aid and Medical Treatment
The following emergency measures are critical in case of mineral acid exposure:
- Skin contact: Rinse immediately and thoroughly with large amounts of water for at least 15 to 20 minutes. Remove contaminated clothing. Seek medical attention.
- Eye contact: Flush eyes immediately with plenty of water; seek immediate ophthalmologic care.
- Inhalation: Move the person to fresh air immediately; call emergency services (911/112) if breathing difficulties occur.
- Ingestion: Do not induce vomiting (risk of further burns). Call emergency services immediately. If the person is conscious, have them drink plenty of water.
Neutralization with bases (e.g., sodium hydroxide) should not be attempted without medical guidance, as this can trigger further reactions and worsen injuries.
Mineral Acids in the Human Body
Not all mineral acids are harmful to the body. Hydrochloric acid is naturally produced by the stomach as a component of gastric juice and is essential for digesting food and killing pathogens. Phosphoric acid, in the form of phosphate, is a vital component of bones, teeth, DNA, and energy carriers such as ATP.
References
- Hollemann, A.F.; Wiberg, N.: Inorganic Chemistry. Academic Press, San Diego, 2001.
- Federal Institute for Occupational Safety and Health (BAuA): Hazardous Substances – Acids and Alkalis. Available at www.baua.de.
- World Health Organization (WHO): Chemical Safety – Corrosive Substances. Geneva, 2021. Available at www.who.int.
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