Pyroelectric reagent for analyzing cadmium in soil and use method of pyroelectric reagent
A pyrolysis and reagent technology, applied in the field of detection, can solve the problems of low recovery rate, inability to accurately quantitatively analyze the content of cadmium, calcium and magnesium in soil without significant correlation, etc.
Pending Publication Date: 2021-11-26
CHANGSHA KAIYUAN HONGSHENG TECHNOLOGY CO LTD +1
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Problems solved by technology
[0004] However, experiments have confirmed that the direct determination of cadmium in soil samples by "electrothermal evaporation (heated quartz tube)-hydrogen flame atomization-atomic absorption method" encounters soil samples with high calcium and high magnesium content, and the determination recovery rate of cadmium is often low, but Low trend is not significantly correlated with calcium and magnesium content
The complexity of the soil sample matrix and the diversity of cadmium in soil samples make it impossible to accurately quantitatively analyze cadmium in soil when the "electrothermal evaporation (heated quartz tube)-hydrogen flame atomization-atomic absorption method" is applied.
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[0035] A) The formulation of an effective pyrolytic agent:
[0036] Formula 1: Add oxalic acid and quartz sand solids to potassium chloride solids, and mix them thoroughly in the mass ratio range (0.01-0.3): (0.01-0.1): 1; the oxalic acid is high-grade pure, and its cadmium content is low 0.0001mg / kg; quartz sand is 300-1000 mesh quartz sand powder, its cadmium content is less than 0.0001mg / kg; potassium chloride is superior grade, its cadmium content is less than 0.0001mg / kg. After the three are fully stirred with a traditional Chinese medicine grinder, they will be in the state of uniform white powder or slightly yellow powder, which is easy to absorb moisture and should be sealed and protected from light.
[0037]Formula 2: add oxalic acid solid and sodium silicate solid to saturated potassium chloride aqueous solution in the mass ratio range (0.01-0.3): (0.001-0.01): 1, and shake well; the oxalic acid is superior grade pure, its The cadmium content is lower than 0.0001mg / ...
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The invention provides a pyroelectric reagent for analyzing cadmium in soil. Thepyroelectric reagent comprises potassium chloride, and the potassium chloride is potassium chloride particles or a saturated potassium chloride aqueous solution. The invention also provides a use method of the pyroelectric reagent for analyzing cadmium in soil. The pyroelectric reagent provided by the invention is introduced into an electric heating evaporation-hydrogen flame atomization-atomic absorption method, and the recovery rate of direct determination of cadmium in soil can be effectively improved, so that the purpose of accurately determining the content of cadmium in soil is achieved.
Description
technical field [0001] The invention relates to the technical field of detection, in particular to a pyrolysis reagent for analyzing cadmium in soil and a use method thereof. Background technique [0002] At present, the methods for accurately determining cadmium in soil mainly use corrosive reagents such as sulfuric acid, nitric acid, hydrochloric acid, hydrofluoric acid, and hydrogen peroxide, and use pretreatment methods such as microwave digestion apparatus, electric heating plate digestion apparatus, and high-pressure tank digestion apparatus to prepare soil samples. Uniform solution state, and then use graphite furnace atomic absorption spectrometer, inductively coupled plasma emission spectrometer, chemical vapor generation atomic fluorescence spectrometer, inductively coupled plasma mass spectrometer, etc. to measure cadmium in the solution. The above-mentioned analysis process is complex and time-consuming, and there are many factors that are likely to cause analysi...
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Login to View More IPC IPC(8): G01N21/31
CPCG01N21/3103
Inventor 冯礼穆莉孙果肖特黄锋邓建贾鸿宇
Owner CHANGSHA KAIYUAN HONGSHENG TECHNOLOGY CO LTD