Multi-parameter water quality detection method and multi-parameter water quality detector based on same

Abstract

A multi-parameter water quality detection method comprises the steps as follows: (1) preparing a standard solution, (2) creating a standard curve, 3) sampling a sample, 4) preprocessing the sample, 5) performing experimental determination and 6) calculating permanganate index concentration, ammonia nitrogen concentration and total nitrogen concentration. A multi-parameter water quality detector comprises a main unit body provided with a storage bin and an experiment bin. According to the detection method, detection of a permanganate index, ammonia nitrogen, total nitrogen, nitrite nitrogen and nitrate nitrogen of a to-be-detected substance is realized through an absorption spectrum, the operation procedure is simplified, the on-line condition of the detector is facilitated, the defects of many required instruments and high cost of the different traditional methods are overcome, multiple parameters can be detected on line in real time by one detector, the measurement time is short, the accuracy is high, the detection limit is low, the lowest detection limit of total nitrogen is 0.5 mg / L, the lowest detection limit of ammonia nitrogen is 0.1 mg / L, the lowest detection limit of the permanganate index is 0.1 mg / L, and the detection requirements of the Quality standard for ground water and the Environmental quality standards for surface water (GB3838-2002) for total nitrogen, ammonia nitrogen and the permanganate index can be met.

Description

technical field [0001] The invention belongs to the field of water quality detection, and relates to an experimental method and a monitor for on-line detection of multi-parameters of water quality realized by gas-phase molecular absorption spectroscopy. Background technique [0002] At present, the country attaches great importance to water quality monitoring. There are many instruments and methods that can be used for water quality testing. Gas-phase molecular absorption spectrometer is one of them. It can be widely used in drinking water production, environmental monitoring, petrochemical industry, sanitation and epidemic prevention, food industry, soil, etc. Water quality analysis in various fields such as chemical fertilizers, chemical reagents, papermaking, leather, printing and dyeing, industrial and mining enterprises, civil engineering, marine and fishery, and hydrological monitoring. The indicators that need to be tested for comprehensive evaluation of water quality...

AI Technical Summary

Problems solved by technology

The indicators that need to be tested for comprehensive evaluation of water quality indicators include chemical oxygen demand, ammonia nitrogen, permanganate index, total nitrogen, and total phosphorus. ), nitrite nitrogen (HJ / T197-2005), nitrate nitrogen (HJ / T198-2005), total nitrogen (HJ / T199-2005), sulfide (HJ / T200-2005) meet the Ministry of Environmental Protection standards For the measurement items of the method, according to the national standard, the detection methods and reagents used for each parameter are different, such as photometric method, direct colorimetric method, digestion method, titration method, etc., all of which are mainly manual operation in the laboratory, and the operation is relatively simple. complex

Moreover, each method has a relatively single detection index, requires many types of reagents, and has a greater risk of secondary pollution to the environment. It is also difficult to realize the detection of multiple parameters by one instrument, which cannot meet the requirements of online real-time detection of multiple parameters.

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