Sampling device and sampling method for water quality detection

Abstract

The invention discloses a sampling device for water quality detection and a using method of the sampling device. The sampling device is a portable or on-line sampling and separating system capable oftaking out a plurality of samples from a water body to be monitored in situ by utilizing the principle of a liquid communicating vessel,a main body of the system consists of a filter, a flow control valve, a first three-way ball valve, a portable sample separation pipe, a second three-way ball valve and an online sample separation pipe, and a portable colorimetric component or an online sample preparation component is combined to finish the sampling, sample preparation and detection tasks together. The device is in modular design, realizes the instrument design concept of separating the sampletaking and matching from detection and analysis, and is convenient for the daily maintenance and troubleshooting. On one device, the manual portable sampling and automatic online sampling modes are realized at the same time, the spectrophotometry principle can be used, and the water quality state can be conveniently detected by adopting the electrochemical sensor principle. According to the present invention, the automatic cleaning step can be set, and the memory effect of two times of detection is reduced; a portable or on-line sampling mode can be selected and applied according to the use condition, and the multi-purpose, multi-mode and multi-parameter detection requirements are met.

Description

technical field [0001] The invention relates to the field of water quality detection and sampling, in particular to a portable or on-line sampling system for simultaneously taking out multiple samples in situ from the water quality to be monitored by using the principle of a liquid connector. Background technique [0002] The state of water quality used in large lakes, aquaculture ponds, ornamental fish ponds, and industrial cooling water is of great significance to its use; the water quality of surface water such as rivers, lakes, and reservoirs is crucial to the quality of human production and life. At present, the technical means of water quality testing are mainly based on sampling personnel taking samples on site, storing them under certain conditions, and transporting them to laboratories for testing. For some elements and inorganic salts and other stable detection parameters, this method has a better effect; but for ammonia nitrogen, COD, BOD which reflect the real-ti...

AI Technical Summary

Problems solved by technology

The U.S. patent No. US 5,795,996 discloses a device that uses a conductivity meter, a PH meter, and a device for measuring the amount of oxygen in water to monitor water quality in cooling towers, swimming pools, and boilers. It cannot be extended to reflect water pollution. Ammonia nitrogen, COD, BOD 5 and total phosphorus and other routine parameters for accurate determination

The invention patent with application number 201710729151.4 discloses an online detection unit for water pollution. Its core is to use a variety of sensors to detect water in real time. Unfortunately, the sensor method is not currently the standard method in the field of water quality detection in the environmental protection industry. For some parameters , there is the problem of poor accuracy and comparability of the detection results

[0004] In summary, the current mainstream detection methods of "on-site sampling, long-distance transportation, and laboratory testing" have the problem that the test results cannot reflect the real-time conditions of the sampling points in time; while the existing online or portable testing equipment detects multiple parameters at the same time In the process, the detection principle is single; in terms of sampling and sample preparation, there are shortcomings of complex design and difficult maintenance, and it is impossible to realize the equipment integration of portable multi-parameter detection and online multi-parameter detection

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