System and method used for simultaneous on-line monitoring of plurality of heavy metals in water

Abstract

The invention discloses a system used for simultaneous on-line monitoring of a plurality of heavy metals in water. The system comprises an on-line sampling module which is used for timing sampling andpretreatment, an on-line digestion module which is used for continuous on-line heat digestion, an on-line enriching module which is used for enrichment, an on-line detection module, a data processing/output module which is used for comparison analysis of detected results with corresponding water quality standard limit values, and a system control module which is used for controlling running of the above modules; the data processing/output module is connected with the on-line detection module; the system control module is connected with the on-line sampling module, the on-line digestion module, the on-line enriching module, and the on-line detection module respectively. The system is high in sensitivity, accuracy, and precision, wide in detection range; simultaneous detection of a plurality of parameters is realized, the response speed is high, and real time and dynamic change monitoring of the content of heavy metals in water is realized.

Description

technical field [0001] The invention relates to the technical field of environmental monitoring, in particular to a simultaneous online monitoring system and monitoring method for multiple heavy metals in water. Background technique [0002] The current situation of my country's water resources has problems such as total shortage, low per capita occupancy, uneven regional distribution, increasing water pollution, and prominent urban water shortages. At present, the daily discharge of sewage and wastewater in my country has reached 100 million cubic meters. According to the Bulletin of the State of the Environment in China in recent years, nearly 1 / 3 of the monitoring sections of my country's surface water is below Class IV, and 60% of the monitoring points of my country's groundwater have poor or extremely poor water quality. Heavy metal pollution is one of the most harmful water pollution problems. In my country, the problem of heavy metal pollution in surface water is ver...

AI Technical Summary

Problems solved by technology

However, when the colorimetric method is used for online analysis of water quality, different heavy metal components require different color reagents. In order to eliminate the interference of other components, special methods are required for sample processing. A single instrument cannot simultaneously measure two or more heavy metals. ions (when the monitoring parameters of heavy metals are increased, the volume and cost of the instrument will be greatly increased). At the same time, the online analysis of heavy metals in this method has low sensitivity and is easily interfered by coexisting ions. It is more suitable for high-concentration water samples and wastewater, and cannot meet the requirements of Application in surface water, groundwater, drinking water and other water environments with low concentrations of heavy metals

Electrochemical online detection mostly uses anodic stripping voltammetry, which has good sensitivity, but poor reproducibility in monitoring, and is easily interfered by organic matter in water, etc. Water samples need to be pretreated, and the heavy metals to be measured are required to be in an ionic state ; In addition, in order to prolong the service life of the electrode, in addition to the high requirements for the electrode maintenance technicians, the upper limit of the measurement of this method is low, and the measurement range is not wide

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