Calibration method for on-line total chromium analyzer

Abstract

The invention relates to a calibration method for an on-line total chromium analyzer. The calibration method comprises the following steps that (1) the preparation work such as connection of a calibration device is carried out; (2) an upper computer calculates and acquires the amount of mother liquor of a standard solution and the amount of diluent; (3) a second control module controls a second injection pump to suck the diluent from a diluent bottle and inject the diluent into a solution mixing device, a first control module controls a first injection pump to inject the mother liquor of the standard solution into the solution mixing device, and a circuit control unit controls an electromagnetic stirrer to carry out stirring; (4) a computer sends a sampling instruction to the detected on-line total chromium analyzer, the on-line total chromium analyzer transmits the analysis information of the water quality to the upper computer; and (5) the upper computer analyzes, detects and automatically calibrates the on-line total chromium analyzer. The calibration method for the on-line total chromium analyzer has the advantage that targeted automatic calibration and inherent error correction of the on-line total chromium analyzer can be realized.

Description

technical field [0001] The invention relates to a calibration method, in particular to a calibration method for an online total chromium analyzer. Background technique [0002] Chromium in wastewater is mainly trivalent chromium (Cr 3+ ) and hexavalent chromium (CrO 4 2- ,Cr 2 o 7 2- ) exists in two forms, and total chromium refers to the sum of all forms of chromium present. It is an important indicator for evaluating the relative content of organic substances in water bodies. It is mainly used for environmental monitoring in the fields of petroleum, chemical industry, and electroplating. [0003] The total chromium water quality automatic monitor can be roughly divided into two categories according to the technical principle, one is spectrophotometric, and the other is electrochemical principle. Among them, the principle of spectrophotometry is: in an acidic solution medium, under a certain temperature and pressure, chromium in different valence states and forms in ...

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Problems solved by technology

[0006] At present, none of the measurement institutions has carried out research on similar instruments, and there are no verification procedures or calibration specifications for online total chromium analyzers at home and abroad.

At the same time, the existing automatic calibration device of the analyzer itself has certain inherent errors, but currently there is no calibration device for the online total chromium analyzer and a correction plan for its inherent errors

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