Traditional Culture Encyclopedia - Traditional festivals - What are the methods of detection of heavy metals?
What are the methods of detection of heavy metals?
The detection of heavy metals are:
1, thioacetamide method: applicable without organic destruction, soluble in water, dilute acid, ethanol drugs in the heavy metals check for the most commonly used methods.
2, after burning thioacetamide method: for insoluble or insoluble in water, dilute acid or ethanol drugs, or by certain factors (such as their own color of the drug, the heavy metals in the drug is not free or heavy metal ions and drugs to form coordination compounds, etc.) interference is not suitable for the first method of heavy metal detection of the drug check.
3, sodium sulfide method: for soluble in alkali and insoluble in dilute acid or in dilute acid, that is, the formation of precipitation in the detection of heavy metal impurities in drugs.
Properties of heavy metals:
Metals with a density of 4.5g/cm3 or more are called heavy metals. There are 60 naturally occurring metallic elements with atomic numbers ranging from 23(V) to 92(U), and except for 6 of them, the densities of the remaining 54 are all greater than 4.5g/cm3, so in the sense of density, these 54 metals are all heavy metals. However, when the elemental classification is carried out, some of them belong to rare earth metals, and some of them are classified as refractory metals.
Both the air, soil, and even drinking water contain heavy metals, such as free radicals that cause aging, skin damage particles, airborne dust, automobile exhaust, and so on, and even tap water to the skin with heavy metals, and even some skin care products such as moisturizers and other heavy metal raw materials such as cadmium, is also one of them. The accumulation of heavy metals is quite harmful to the human body.
Above reference: Baidu Encyclopedia - Heavy Metals
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