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Calcium and magnesium ions in water are sequestered by the addition of disodium ethylenediamine tetraacetate. The end point of the reaction is detected by. Revision: Edition, December 1, ; Published Date: December 1, ; Status: Active, Most Current; Document Language: Published By: ASTM. Find the most up-to-date version of ASTM D at Engineering

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Standard – Standard Test Method for Hardness in Water ASTM D –

Please first log in with a verified email before subscribing to alerts. Link to Active This link will always route to the current Active version of the standard. It is possible to differentiate between hardness due to calcium ions and that due to magnesium ions by axtm test method.

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Standard Test Method for Hardness in Water

This test method is applicable to waters that are clear in appearance and free of chemicals that will complex calcium or magnesium. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. With most normal alkaline water, these soap-wasting properties are directly related to the calcium and magnesium content. This test method is applicable to waters that are clear in appearance and free of chemicals that will complex calcium or magnesium.

The term hardness was originally applied to water in which it was hard to wash; it referred to the soap-wasting properties of water.

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It is the user’s responsibility to ensure the validity of the test method for waters of untested matrices. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

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