Method for simultaneously detecting multiple trace elements in iron-containing waste acid

Abstract

The invention belongs to the field of element analysis, and provides a method for simultaneously detecting various trace elements in iron-containing waste acid. The method comprises the following steps: carrying out sample pretreatment: pretreating a sample; weighing 2-15 g of an iron-containing waste acid sample; adding 20-50 mL of hydrochloric acid and 2-5 g of an oxidizing agent; performing stirring until the iron-containing waste acid is completely oxidized into ferric trichloride, transferring a to-be-detected sample into a separating funnel, adding 10-30 mL of an extracting agent, performing extracting for 3-5 times to completely extract Fe3+, taking a water layer, enriching in a water bath, transferring a sample solution into a 50 mL volumetric flask, fixing the volume, forming uniform shaking, and making a blank at the same time; selecting an element spectral line; drawing a standard curve; and detecting the sample. According to the method, the spectral interference caused by an iron matrix is effectively eliminated, the detection limit of the method is reduced, a method for simultaneously determining various trace elements in the iron-containing waste acid by utilizing aninductively coupled plasma emission spectrometer is created, the detection time is shortened, and the working efficiency is improved.

Description

technical field [0001] The invention belongs to the field of elemental analysis, and relates to a method for simultaneously detecting the content of As, Pb, Cd, Co and V elements in waste iron-containing acid, in particular to a method for simultaneously detecting As in waste iron-containing acid by using an inductively coupled plasma emission spectrometer , Pb, Cd, Co, V and other trace elements. Background technique [0002] Iron-containing waste acid can be used as a raw material for the production of ferric chloride, a water treatment agent. There are no corresponding standards and detection methods for testing various heavy metals. The test method for heavy metals in ferric chloride is often borrowed, using atomic absorption spectrophotometer and atomic fluorescence The photometer tests As, Pb, Cd, Co, V and other heavy metals. When testing each element, standard solutions and samples need to be prepared separately, which makes the operation complex and cumbersome, wi...

AI Technical Summary

Problems solved by technology

When directly testing trace elements such as As, Pb, Cd, Co, V in iron-containing waste acid, because the content of iron matrix is ​​too high, the content of trace elements is too low, which will lead to high background, background disconnection, Spectral interference phenomena such as main peak elevation, main peak drift, and main peak broken peaks lead to large deviations in test results, and it is impossible to directly test traces of As, Pb, Cd, Co, V and other elements in iron-containing waste acid. The matrix is ​​separated, and the separation process cannot introduce or lose heavy metals

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