Test paper for detecting water hardness and detecting method

Abstract

The invention provides a test paper and a quantitative test method for the overall hardness of water quality..dippin a test paper into a mixture solution composed of: 0.2-1mg / L complex black T; 0.01-0.05mmol / LDTA magnesium salt; 4-40mL / 100ml PH7-11 mixture of sodium tetraborate-sodium hydroxide; 0.5-2g / L ammonium salt; 1-4mg / L of DDTC 5-10 min, airing it dry and plastic sealed with film machine, the test method is:cutting one end of it open and dipping it vertically into the mixture for 5-10min, after reacting with thecalaum ion,megnesium ion to produce a red complex, measuring the height of the red complex, the overall hardness of the water quality is determined The invention has the advantages of accuracy, convenience to operation, strong anti-pollution, etc,it is convenient for long-time preservation and can test quickly the on the spot. The test paper can be applied to testing the overall hardness of a variety of drinking water, boiler water, industrial circulating cooling water, surface water and groundwater.

Description

technical field

[0001] The invention belongs to water quality detection technology, in particular to a test paper and a detection method for quantitative detection of water quality total hardness. Background technique

[0002] At present, the determination of total water hardness is essential in industrial production, environmental monitoring, and domestic water, and has been paid more and more attention. Generally, chemical analysis and instrumental analysis are used to detect the total hardness of water quality. These methods require professional analysis and inspection technicians, and they are carried out in the laboratory with certain equipment, instruments, utensils and chemical reagents, and the determination process is cumbersome and time-consuming. . Also have to adopt test paper method to measure the total hardness of water quality, solve the above-mentioned problem of existence. For example the Chinese patent of application number 99111693, 3 has announced " a k...