Reagent and method for fast detecting water quality total hardness

A technology for testing reagents and total hardness, which is applied in the field of analytical chemistry, can solve problems such as the inability to realize rapid on-site detection, and achieve the effects of fast testing speed, saving testing costs, and good stability

Inactive Publication Date: 2016-03-09
GUANGDONG HUANKAI MICROBIAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires the preparation of EDTA standard solution, chrome black T indicator solution, and ammonia-ammonium chloride buffer solution,

Method used

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  • Reagent and method for fast detecting water quality total hardness
  • Reagent and method for fast detecting water quality total hardness
  • Reagent and method for fast detecting water quality total hardness

Examples

Experimental program
Comparison scheme
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preparation example Construction

[0040] Preferably, the preparation method of described standard color comparison card comprises the following steps:

[0041] 1) Use pure water to prepare a calcium carbonate standard solution with a concentration of 25mg / L, immerse the total water hardness rapid detection test paper in the standard solution, take it out after 2 seconds, shake off the excess solution, and wait until the color of the test paper is stable. Find the corresponding standard color on the Pantone color card;

[0042] 2) With the method described in step 1), respectively obtain the standard colors presented by the test paper when the detection concentration is 0 mg / L, 50 mg / L, 120 mg / L, 250 mg / L, and 425 mg / L calcium carbonate standard solution;

[0043] 3) The color value of each standard color is obtained by comparing with the Pantone color card, and the standard color card is obtained through computer color matching and printing.

Embodiment 1

[0046] Preparation of test paper for rapid detection of total water hardness:

[0047] Use pure water to prepare a mixed chromogenic solution containing 0.50 g / L calcium magnesium reagent, 0.22 g / L methyl orange, 0.37 g / L disodium magnesium edetate, and 0.10 mol / L borax. Soak the chromatographic filter paper completely in the above mixture for about 10 minutes, take out the filter paper, and dry it in vacuum at 75°C, cut the filter paper into small pieces of 5×6mm, and stick them on one end of the strip-shaped bottom plate of 5×80mm with glue , to obtain the total water hardness rapid detection test paper 1#.

[0048] Preparation of standard color chart:

[0049] 1) Prepare a calcium carbonate standard solution with a concentration of 25mg / L in pure water, immerse the prepared water quality total hardness rapid detection test paper in the solution, take it out after 2 seconds, shake off the excess solution, and after 15 seconds, according to the color of the test paper F...

Embodiment 2

[0053] Preparation of test paper for rapid detection of total water hardness:

[0054] Prepare a mixed display solution containing 0.45g / L calcium magnesium reagent, 0.20g / L methyl orange, 0.35g / L disodium magnesium edetate, 0.14mol / L borax, and 0.015mol / L lithium hydroxide with pure water. color liquid. Soak the chromatographic filter paper completely in the above mixture for about 10 minutes, take out the filter paper, and dry it in vacuum at 75°C, cut the filter paper into small pieces of 5×6mm, and stick them on one end of the strip-shaped bottom plate of 5×80mm with glue , to obtain the total water hardness rapid detection test paper 2#.

[0055] Preparation of standard color chart:

[0056] 1) Prepare a calcium carbonate standard solution with a concentration of 25mg / L in pure water, immerse the prepared water quality total hardness rapid detection test paper in the solution, take it out after 2 seconds, shake off the excess solution, and after 15 seconds, accordin...

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Abstract

The invention discloses a reagent and method for fast detecting water quality total hardness. The reagent for fast detecting the water quality total hardness comprises an indicator, a dyeing assisting agent and a sensitizer with the mass ratio of (35-50):(18-22):(25-37). The method for detecting the water quality total hardness comprises the following steps that 1, filter paper is immersed in a solution prepared from the reagent for fast detecting the water quality total hardness, soaked and dried, and water quality total hardness fast detecting test paper is obtained; 2, the water quality total hardness fast detecting test paper is immersed in a test solution prepared from a sample to be tested, and taken out after two seconds, the excessive solution on the test paper is thrown away, after color developing is complete, the standard colourimetric card is compared, and the water quality total hardness is obtained. The reagent for fast detecting the water quality total hardness is high in sensitivity, good in stability, easy and convenient to operate, economical and practical. The detecting method can fast detect the water quality total hardness on site, response time is short, testing speed is high, and the testing method can be used for fast testing the total hardness of drinking water, boiler water, alkaline mineral water, surface water, underground water, industrial consumption, waste water and the like.

Description

technical field [0001] The invention relates to a rapid detection reagent and a detection method for the total hardness of water, belonging to the field of analytical chemistry. Background technique [0002] Water hardness is an important monitoring index of water quality. If water hardness is too high, it will cause harm to human health, daily life, and industrial production. There are certain regulations on the total hardness of water quality in various water quality standards such as industrial boiler water and condensate water, domestic drinking water, and groundwater. In addition, the water used in the hemodialysis room of the hospital also has strict requirements on the total hardness of the water quality. Excessive water hardness is the main reason for the formation of boiler scale. Excessive water hardness will also affect the quality of related products. Therefore, the total hardness of water, that is, the determination of the total amount of calcium and magnesium...

Claims

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Application Information

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IPC IPC(8): G01N21/78G01N33/18
CPCG01N21/78G01N33/1853
Inventor 李方方吴清平邓金花秦惠
Owner GUANGDONG HUANKAI MICROBIAL SCI & TECH
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