All-in-one heavy metal online analyzer

Abstract

The invention discloses an all-in-one heavy metal online analyzer which comprises a multi-ported valve, at least one reagent bottle, a pure water cylinder, a plunger pump, a mixing cylinder, a reactor and a waste liquid cylinder, wherein the at least one reagent bottle is respectively in pipe connection with each port of the multi-ported valve, the mixing cylinder is provided with a stirrer, one port of the multi-ported valve is communicated with air, the volume of a liquid carrying tube between the multi-ported valve and the plunger pump is greater than the volume of a single reagent with the maximum volume required in the analysis process, the mixing cylinder and the reactor are in pipe connection with the pure water cylinder and a water sample cylinder through a selection valve and a sampling pump and can be used for respectively pumping liquid to the mixing cylinder or the reactor from the pure water cylinder or the water sample cylinder, the mixing cylinder is in pipe connection with a quantitative / liquid discharging pump which can pump evenly-stirred mixed liquid to the reactor, and the quantitative / liquid discharging pump and the selection valve are also in pipe connection among the waste liquid cylinder, the mixing cylinder and the reactor so as to pump waste liquid in the mixing cylinder and the reactor into the waste liquid cylinder. The invention also discloses a method for analyzing heavy metals in a water sample by utilizing the all-in-one heavy metal online analyzer. The invention has the advantages of low cost, low detection limit (the detection limit can reach a ppt (part per trillion) level), no secondary pollution, small maintenance amount and low operation cost.

Description

technical field [0001] The invention relates to a heavy metal analyzer, in particular to an all-in-one heavy metal online analyzer. Background technique [0002] In the current domestic and foreign markets, heavy metal online analyzers are mainly divided into two types according to different measurement principles. One type is a heavy metal online analyzer based on the principle of ultraviolet-visible light photometry. , Molecular absorption spectrum in the visible light region, methods for qualitative analysis, quantitative analysis and structural analysis of substances. According to the different wavelength regions of the absorbed light, it is divided into ultraviolet spectrophotometry (60-400nm) and visible spectrophotometry (400-750nm), collectively referred to as ultraviolet-visible spectrophotometry. Most of the water quality online monitoring instruments currently on the market adopt this method. The other type is an online heavy metal analyzer using electrochemical...

AI Technical Summary

Problems solved by technology

However, at present, the heavy metal on-line analyzers with sampling electrochemical methods at home and abroad generally use mercury electrodes (dropping mercury, static dropping mercury, suspended mercury) or mercury film electrodes as working electrodes. Due to the strong toxicity of mercury and mercury oxides, it will Cause secondary pollution to the measured water body

Moreover, the current domestic electrochemical heavy metal online analyzer is basically monopolized by foreign instruments. The purchase cost of the instrument is relatively high, and it is difficult to promote and use it in China.

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