Digestion method of detection of heavy metals in soil

Abstract

The invention discloses a digestion method of detection of heavy metals in soil. The digestion method is characterized by comprising the following steps: only adding a small amount of nitric acid and a small amount of hydrofluoric acid into a sample; after leaving the mixture to stand overnight, digesting on a graphite digestion device at a certain temperature to completely digest the soil sample; detecting with graphite furnace atomic absorption spectrometry or inductively coupled plasma optical emission spectrometry. The digestion method is accurate and reliable, and meets the detection demands.

Description

technical field [0001] The invention relates to the field of pretreatment of heavy metal detection, in particular to the wet digestion method of soil Background technique [0002] The pretreatment method of heavy metal detection in soil is in accordance with the current national standards such as "GB 17141-1997 Determination of Lead and Cadmium Graphite Furnace Atomic Absorption Spectrophotometry", "GB 17138-1997 Soil Quality Copper and Zinc Determination of Flame Atomic Absorption Spectrophotometry ", "GB17140-1997 Determination of Lead and Cadmium in Soil Quality KI-MIBK Extraction Flame Atomic Absorption Spectrophotometry", etc. generally use four-acid digestion (hydrochloric acid, nitric acid, hydrofluoric acid, perchloric acid) method on polytetrafluoroethylene Digestion is carried out in a crucible. This type of method is cumbersome, highly dangerous, consumes a large amount of reagents, and has high requirements for inspectors. It is not suitable for the detection of ...

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Problems solved by technology

[0002] The pretreatment method of heavy metal detection in soil is in accordance with the current national standards such as "GB 17141-1997 Determination of Lead and Cadmium Graphite Furnace Atomic Absorption Spectrophotometry", "GB 17138-1997 Soil Quality Copper and Zinc Determination of Flame Atomic Absorption Spectrophotometry ", "GB17140-1997 Determination of Lead and Cadmium in Soil Quality KI-MIBK Extraction Flame Atomic Absorption Spectrophotometry", etc. generally use four-acid digestion (hydrochloric acid, nitric acid, hydrofluoric acid, perchloric acid) method on polytetrafluoroethylene Digestion is carried out in a crucible. This type of method is cumbersome, highly dangerous, consumes a large amount of reagents, and has high requirements for inspectors. It is not suitable for the detection of large quantities of soil samples.

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