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...

AI Technical Summary

Problems solved by technology

For example the Chinese patent of application number 99111693, 3 has announced " a kind of water quality total hardness test paper ", and the Chinese patent of application number 01132383, 3 has announced " a kind of water quality total hardness detection test paper and preparation method ", but all exists test paper in use The problem of easy contamination during the process, for example, the part soaked in water samples cannot be touched, and it cannot be mixed with other unused test strips. If one piece of test paper is taken out of a package, although the other test papers are not used, they are easy to deteriorate and fail to varying degrees due to contact with air; in addition, because the detection is based on the color depth of the colored substance generated by the reaction between the water sample and the test paper, or the color of the test paper Judging the total water hardness by the changes of blue, blue purple, and purple red will cause a large error in the test of total water hardness due to the difference in the ability of human eyes to distinguish colors, which cannot meet the technical requirements of quantitative determination