Matrix modifier for determining heavy metals absorbed by graphite furnace atoms and preparing method

Abstract

The invention discloses a matrix modifier for determining heavy metals absorbed by graphite furnace atoms, and a preparing method. The matrix modifier is colloid palladium, and the preparing method of the matrix modifier comprises the following steps of: weighing 0.024g-0.036g of palladium chloride, and placing into a reacting container; converting into H2PdC14.nH2O by using concentrated hydrochloric acid; adding 0.030g of polyvinylpyrrolidone; then, slowly adding 60mL of mixing solution of methanol and water, continuously stirring and uniformly mixing in the adding process, placing the solution into a water bath tank for refluxing by heating for 90 minutes, and then taking out a brown colloid solution which is the target palladium. The novel matrix modifier can achieve high podzolizing temperature, the interference matrix can be effectively removed in the podzolizing stage, and the purpose for reducing or eliminating the interference is achieved. The colloid palladium prepared by the invention has uniform particle distribution, and no obvious aggregation phenomenon.

Description

technical field [0001] The invention relates to a matrix modifier for the determination of heavy metals by graphite furnace atomic absorption and a preparation method. Background technique [0002] Heavy metals generally refer to metals with an atomic weight greater than 55, mostly transition elements. Such as copper, lead, zinc, iron, cobalt, nickel, manganese, cadmium, mercury, tungsten, molybdenum, gold, silver, etc. Although heavy metals such as manganese, copper, and zinc are trace elements needed for life activities, most heavy metals such as mercury, lead, and cadmium are not necessary for life activities, and all heavy metals are harmful to the human body if they exceed a certain concentration. In addition, although arsenic is not a heavy metal, it is usually included in the category of heavy metals for research and discussion because its source and hazards are similar to those of heavy metals. With the progress of toxicology, the neurotoxicity and chronic toxicity...

AI Technical Summary

Problems solved by technology

[0004] The earliest proposed compound palladium matrix modifier is palladium chloride, metal palladium and palladium oxides are generally considered to be the active form of palladium matrix modifier, a class of matrix modifiers are palladium compounds such as palladium chloride and palladium nitrate, This type of modifier basically requires high heat to convert it into active palladium. Such a pretreatment method will increase the analysis time by 30-40%, and cannot stabilize volatile analytes; the other type is a palladium complex. and reducing agents, the main disadvantage of this type of improver may be its poor reproducibility

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