Total cadmium analysis method

Abstract

The invention discloses a novel total cadmium analysis method. According to the method, a total cadmium analysis device is adopted for analysis and comprises a sample injection pipeline, a water sample detector, a peristaltic pump, a mixing tube, a cuvette, a high temperature heater and three-way valves QC, QD and QF. A liquid inlet is formed in the side of the mixing tube; liquid outlets are respectively formed in the top and bottom of the mixing tube; and the inlet in the side of the mixing tube is connected with the peristaltic pump. One end of the cuvette is connected with the liquid outlet in the bottom of the mixing tube; the other end of the cuvette is connected with a normally open end of the QF; the liquid outlet above the mixing tube is connected with a normally closed end of theQF; a common end of the QF is connected with a common end of the QC; the high temperature heater is connected with the normally closed ends of the QC and the QD; and a normally open end of the QC isconnected with a normally open end of the QD. The method has the beneficial effects of providing a novel total lead analysis system, adopting a brand-new pharmaceutical formula, reducing a condensingreflux device on the basis of the existing total cadmium analysis method, and improving the stability of analysis results.

Description

technical field [0001] The invention relates to the technical field of total cadmium analysis, in particular to a total cadmium analysis method. Background technique [0002] The existing total cadmium analysis method is mainly a system with condensing reflux, and its disadvantages are: the sample needs to be cooled in the condensing reflux pipe before it can develop color; in the structure containing condensation, the condensing device includes a condensing reflux pipe, a cooling compressor , cooling circulation pump. When the total cadmium is analyzed, the analysis sample enters the circulating water circuit through the two-position three-way valve. After being heated by the heater, it passes through the condensing return pipe in the circulating water circuit. Outside the return pipe, there is cooling water circulating in the chiller. After the sample is cooled, the added chromogenic agent is used for colorimetry under the colorimetric cell. The existing total cadmium an...

AI Technical Summary

Problems solved by technology

[0002] The existing total cadmium analysis method is mainly a system with condensing reflux, and its disadvantages are: the sample needs to be cooled in the condensing reflux pipe before it can develop color; in the structure containing condensation, the condensing device includes a condensing reflux pipe, a cooling compressor , cooling circulation pump

The existing total cadmium analysis method requires the color temperature of the sample to be analyzed, so it is necessary to control the temperature of the condensation system, but if the temperature control is not good, the absorbance will fluctuate greatly

At the same time, the color developer used in the test process is malachite green, which is highly toxic, and the waste liquid generated is difficult to handle, which is harmful to the environment and human body

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