Method for quickly detecting lead and cadmium by adopting scanning anodic stripping voltammetry

An anodic stripping voltammetric and rapid technology, applied in the field of electrochemical analysis, can solve the problems of complex operation of inductive couple and plasma method, inconvenient on-site detection of ultra-trace heavy metals, and insufficient application fields, etc., achieving good reproducibility, High sensitivity and good accuracy

Inactive Publication Date: 2014-02-19
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Inductive couple and plasma methods are complicated to operate, high in cost, and not widely used
Atomic fluorescence spectrometry has the characteristics of high sensitivity, strong selectivity, small sample volume and simple method, but its disadvantage is that the scope of application is not wide enough
However, in terms of sensitivity, it is still not comparable to methods such as atomic emission spectrometry, inductive couple and plasma methods
This brings inconvenience to the on-site detection of ultra-trace heavy metals in some samples

Method used

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  • Method for quickly detecting lead and cadmium by adopting scanning anodic stripping voltammetry

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A method for rapid detection of lead and cadmium by scanning anode stripping voltammetry is characterized in that it comprises the following steps:

[0034] 1) Soak the test beaker in 5% nitric acid overnight, rinse it with double distilled water, and then dry the number. Measure 50mL of 0.1M acetic acid-sodium acetate buffer solution (pH=4), transfer it to the test beaker, and add lead standard solution Prepare 0.01, 0.05, 0.1, 0.5, 1, 5ug / L series of standard solutions (since the volume of the lead standard solution added is uL level, it can be considered that the volume of the solution to be tested is always constant), and add clean and dry magnets to the on a magnetic stirrer.

[0035] 2) Connect the three-electrode system consisting of mercury film electrode, platinum wire counter electrode and Ag / AgCl reference electrode to the electrochemical workstation and move it into the beaker to fix it.

[0036] 3) Set the electrochemical workstation parameters: deposition...

Embodiment 2

[0040] A method for rapid detection of lead and cadmium by scanning anode stripping voltammetry is characterized in that it comprises the following steps:

[0041] 1) Soak the test beaker in 5% nitric acid overnight, rinse it with double distilled water, and then dry the number. Measure 50mL of 0.1M acetic acid-sodium acetate buffer solution (pH=4), transfer it to the test beaker, and add cadmium standard solution Prepare 0.01, 0.05, 0.1, 0.5, 1, 5ug / L series of standard solutions (since the volume of the cadmium standard solution added is uL level, it can be considered that the volume of the solution to be tested is always constant), and add clean and dry magnets to the on a magnetic stirrer.

[0042] 2) Connect the three-electrode system consisting of mercury film electrode, platinum wire counter electrode and Ag / AgCl reference electrode to the electrochemical workstation and move it into the beaker to fix it.

[0043] 3) Set the electrochemical workstation parameters: depo...

Embodiment 3

[0047] A method for rapid detection of lead and cadmium by scanning anode stripping voltammetry is characterized in that it comprises the following steps:

[0048] 1) Soak the test beaker in 5% nitric acid overnight, rinse it with double distilled water, and then dry the number. Measure 50mL of 0.1M acetic acid-sodium acetate buffer solution (pH=4), transfer it to the test beaker, and add lead and cadmium. Prepare standard solutions of 0.01, 0.05, 0.1, 0.5, 1, 5ug / L series of standard solutions (since the volume of lead and cadmium standard solutions added is uL level, it can be considered that the volume of the solution to be tested is always constant), and add clean and dry The magnet is placed on a magnetic stirrer.

[0049] 2) Connect the three-electrode system consisting of mercury film electrode, platinum wire counter electrode and Ag / AgCl reference electrode to the electrochemical workstation and move it into the beaker to fix it.

[0050] 3) Set the electrochemical wo...

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Abstract

The invention discloses a method for quickly detecting lead and cadmium by adopting scanning anodic stripping voltammetry. The method comprises the following steps: a sample to be tested is prepared; lead or cadmium standard liquid is prepared; a three-electrode system consisting of glassy carbon electrodes plated with mercury films, platinum wire counter electrodes and Ag/AgCl reference electrodes is assembled; parameters are set and the scanning anodic stripping voltammetry is adopted to respectively implement parallel determination for current values between working electrodes and reference electrodes of each standard liquid solution until the relative standard deviation of readings is not more than 5%; lead and cadmium heavy metals of the sample are measured through detecting the current values between the working electrodes and the reference electrodes; a working station automatically calculates to obtain detecting results through automatically searching peaks to determine each curve peak area. The detecting method has the advantages of high sensitivity, good accuracy, reduction of mercury pollution, high electrode stability and good reproducibility, and can be applied to the detection of the heavy metals of lead and cadmium with conventional trace and ultratrace.

Description

technical field [0001] The invention belongs to the technical field of electrochemical analysis, in particular to a method for rapidly detecting lead and cadmium by scanning anode stripping voltammetry. Background technique [0002] Heavy metals refer to atomic density greater than 5g / cm 3 There are about 45 kinds of metal elements, such as copper, lead, zinc, cadmium, manganese, iron, cobalt, mercury, gold, silver and so on. Although heavy metals such as manganese, copper, and zinc are trace elements needed for life activities, most heavy metals such as lead, cadmium, and mercury are not necessary for life activities, and all heavy metals exceeding a certain concentration will cause harm to the human body. With the expansion of cities and the development of large-scale industries, the heavy metal pollution in the atmosphere, soil and water environment is increasing day by day. [0003] Because heavy metals are highly toxic, difficult to be metabolized in the environment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/48
Inventor 张嘉琪胡发志胡馨升陈培飞王雯肖亚兵
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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