Method for judging limit exceeding of heavy metals in water

Abstract

The invention discloses a method for judging whether heavy metals in water exceed the limit. The method comprises the following steps of: S10, preparing a solution to be tested; S20, setting detection parameters at an electrochemical work station; S30, detecting a water sample by an anodic stripping voltammetry method so as to obtain a stripping voltammetry diagram of the water sample, wherein an X-axis is taken as a voltage axis, and a Y-axis is taken as a current axis; S40, searching the starting point and the final point of each peak according to the stripping voltammetry diagram in the electrochemical work station; S50, calculating the peak height according to the starting point and the final point of the peak in the electrochemical work station; and S60, judging whether the heavy metals in the water sample exceed the concentration limited by the national standard GB5749-2006 according to the peak height of each peak in the electrochemical work station. Compared with the prior art, the method has the advantages of less possibility of peak omission, high accuracy and simplicity in detection process.

Description

technical field [0001] The invention relates to the technical field of heavy metal concentration detection in water, in particular to a method for judging whether heavy metals in water exceed the limit by searching for abnormal peaks in stripping voltammograms. Background technique [0002] In the prior art, anodic stripping voltammetry is usually used to measure the concentration of heavy metal ions in water samples. Anodic stripping voltammetry is an electrochemical analysis method that combines potentiostatic electrolytic enrichment with voltammetric determination. The voltammogram curve obtained by this method is peak-shaped, and the peak current is proportional to the concentration of the measured ions in the water sample. The concentration of heavy metal ions can be used to determine whether the heavy metals in the water sample exceed the limit, and the detection of the signal peak is very important for the quantification of the measured ions in the water sample. Ther...

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Problems solved by technology

Both methods need to be measured twice or more to obtain results, and the heavy metal standard solution must be used in the determination process, so when the two methods are used, the detection process is more complicated and cumbersome

[0006] Combining the above points, it can be seen that the existing methods for judging whether heavy metals in water exceed the limit have the defects of easy peak leakage, poor accuracy, and complicated detection process.

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