Specimens for toxicological studies are preserved in: DNB 09; Maharashtra 11; AFMC 12
**Core Concept**
The preservation of specimens for toxicological studies is crucial in forensic medicine to detect and identify substances that may have caused harm or death. The chosen method should prevent degradation of the substance, maintain its chemical integrity, and ensure accurate analysis.
**Why the Correct Answer is Right**
The specimens are typically preserved in a substance that prevents degradation and maintains the chemical integrity of the substance. The most commonly used preservative for toxicological studies is **glacial acetic acid**. This is because acetic acid is a weak acid that prevents bacterial growth, maintains the pH of the specimen, and prevents the breakdown of the substance. It is also non-reactive and does not interfere with the toxicological analysis.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because formalin is typically used for preserving tissues for histopathological examination, not for toxicological studies. Formalin can react with certain substances and alter their chemical structure, making it unsuitable for toxicological analysis.
**Option B:** This option is incorrect because ethanol is used for preserving tissues for histopathological examination, particularly for tissues that are prone to drying out. While ethanol can prevent bacterial growth, it is not the preferred preservative for toxicological studies.
**Option C:** This option is incorrect because water is not a suitable preservative for toxicological studies. Water can lead to the degradation of substances, promote bacterial growth, and alter the chemical integrity of the specimen.
**Clinical Pearl / High-Yield Fact**
In forensic medicine, the preservation of specimens for toxicological studies is critical in determining the cause of death or harm. The use of glacial acetic acid as a preservative helps maintain the chemical integrity of the substance, ensuring accurate analysis and diagnosis.
**Correct Answer:** A. Glacial acetic acid.