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Hardness indicator composition for water hardness measurement and hardness measuring method

A technology of indicator and composition, which is applied in the direction of testing water hardness, chemical instruments and methods, measuring devices, etc., can solve the problems that it cannot be used to measure the hardness of raw water, and the measurement range is narrow.

Inactive Publication Date: 2008-06-25
MIURA COMPANY LIMITED +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to their very narrow measurement range, these indicators cannot be used to measure the hardness of raw water before entering the water softener

Method used

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  • Hardness indicator composition for water hardness measurement and hardness measuring method
  • Hardness indicator composition for water hardness measurement and hardness measuring method
  • Hardness indicator composition for water hardness measurement and hardness measuring method

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Embodiment

[0025] Next, a specific embodiment of the present invention will be described in detail. As the main component of the indicator for hardness measurement of the present invention, a metal indicator is explained first. When selecting a metal indicator, it is important that the metal indicator exhibits color based on hardness. A further condition for selecting a metal indicator is that the absorption maximum of the metal indicator itself exists at the specific absorption wavelength of the metal indicator color. It is also important for metal indicators that the metal indicator has a certain level of solubility and does not deteriorate after formation in an aqueous solution. Therefore, the calcium magnesium indicator etc. represented by general formula (I) are suitable as the metal indicator that can satisfy the above-mentioned conditions:

[0026]

[0027] General formula (I)

[0028] Among them, R is H, OH, NO 2 、CH 3 , SO 3 Either of H and COOH.

[0029] Equally, EBT,...

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Abstract

The present invention relates to a hardness indicator composition, and a method of water hardness analysis, capable of measuring hardness even with higher-hardness water without requiring titration by a two-liquid system. The hardness indicator composition is formulated of a metal indicator with a desensitizer added thereto.

Description

technical field [0001] The invention relates to a hardness indicator composition for measuring the water hardness of industrial water and domestic water, and a method for measuring water hardness using the hardness indicator. Background technique [0002] It is known to use devices for removing hardened substances in the incoming water lines leading to cooling and heating systems such as boilers, water heaters and cooling towers to meet the need to prevent scale deposits in cooling and heating systems. Among them, a class of self-regenerating hard water softeners (hereinafter referred to as water softeners) that use ion exchange resins to remove hardened substances have been widely used. [0003] Usually water hardness is measured before entering the water softener (often very hard) and there has been a way of doing this by using a metal indicator that changes color by reacting with hardening substances (calcium, magnesium, etc.) under alkaline conditions Agent [calcium mag...

Claims

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Application Information

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IPC IPC(8): G01N31/22G01N33/18G01N31/00C09B29/15
CPCG01N33/1853G01N31/22
Inventor 中岛纯一沟上庆太浮穴雄二
Owner MIURA COMPANY LIMITED
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