Hardness measurement reagent

A technology of reagents and hardness, applied in the field of reagents for hardness determination, can solve the problems of slow discoloration, etc., and achieve the effect of easy handling and use of reagents

Inactive Publication Date: 2005-10-05
MIURA COMPANY LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, conventional reagents for hardness measurement have a wide discoloration starting point and discoloration end

Method used

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  • Hardness measurement reagent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5 and comparative example 1～3

[0043] Put 50 milliliters of test water into a 100 milliliter beaker, drop 121 microliters of reagents for hardness determination into the test water with a micro-syringe, and shake the beaker gently. The detection water develops color immediately. Observe the shade after 1 minute from the color development. The results are shown in Table 1. In addition, the discoloration start point, discoloration end point and discoloration range of each test area obtained from the results in Table 1 are shown in Table 3. In this test, the hardness equivalent concentration of EBT and EDTA-4Na in the reagent for hardness measurement after dripping each detection water is measured with CaCO 3 In conversion, reagent 1 is 2.2mg / L (EDTA-4Na is 0.7mg / L, EBT is 1.5mg / L), reagent 2 is 3.5mg / L (EDTA-4Na is 1.0mg / L, EBT is 2.5mg / L ), and both reagent 3 and reagent 4 were 2.5 mg / L (EBT was 2.5 mg / L).

[0044] Reagent

[0045] Compounding ingredients

[0046] Reage...

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Abstract

This invention provides a hardness measurement reagent for measuring the hardness of water, the reagent being capable of causing the test water to change color sesitively at the vicinity of a controlled hardness. The reagent of this invention contains a coloring material selected from an Eriochrome black T (EBT) or a Calmagite, triethanolamine, glycol compound, and an alkali metal salt of a chelate agent.

Description

technical field [0001] The present invention relates to a hardness measuring reagent for measuring hardness contained in industrial water, domestic water, and the like. Background technique [0002] As we all know, in the water supply pipelines of hot and cold equipment such as boilers, water heaters, or coolers, it is necessary to prevent scale from adhering to the hot and cold equipment, so it is connected to remove hardness components (Ca 2+ and Mg 2+ ) device, for example, connect a hard water softening device using ion exchange resin to the water supply pipeline, and convert the hardness component (Ca 2+ and Mg 2+ ) replaced by Na + , and supply the obtained softened water as supply water to heating and cooling equipment. [0003] In the case of using the above-mentioned hard water softening device, when the ion exchange resin contained in the device deteriorates, or the regeneration of the ion exchange resin is insufficient, the hardness component in the supply wat...

Claims

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Application Information

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IPC IPC(8): G01N31/22G01N21/77G01N21/78G01N31/00G01N33/18
CPCG01N21/78G01N31/22G01N33/1813
Inventor 光本洋幸
Owner MIURA COMPANY LIMITED
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