ASTM International

Standard Test Method for Hardness in Water
 N D1126

Annotation

This test method covers the determination of hardness in water by titration. This test method is applicable to waters that are clear in appearance and free of chemicals that will complex calcium or magnesium. The lower detection limit of this test method is approximately 2 to 5 mg/L as CaCO3; the upper limit can be extended to all concentrations by sample dilution. It is possible to differentiate between hardness due to calcium ions and that due to magnesium ions by this test method.

This test method was tested on reagent water only. It is the user's responsibility to ensure the validity of the test method for waters of untested matrices.

The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

*A Summary of Changes section appears at the end of this standard

Автоматический перевод:

Метод стандартной пробы для твердости в воде

Этот метод испытаний покрывает определение твердости в воде титрованием. Этот метод испытаний применим к водам, которые являются ясными по внешности и не содержащими химикатов, которые объединят кальций или магний. Более низкий предел обнаружения этого метода испытаний составляет приблизительно 2 - 5 мг/л как CaCO3; верхний предел может быть расширен на все концентрации типовым разводнением. Возможно дифференцироваться между твердостью вследствие ионов кальция и этим вследствие ионов магния этим методом испытаний.