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  2. Hardness comparison - Wikipedia

    en.wikipedia.org/wiki/Hardness_comparison

    A variety of hardness-testing methods are available, including the Vickers, Brinell, Rockwell, Meyer and Leeb tests. Although it is impossible in many cases to give an exact conversion, it is possible to give an approximate material-specific comparison table for steels.

  3. Hardnesses of the elements (data page) - Wikipedia

    en.wikipedia.org/wiki/Hardnesses_of_the_elements...

    Unsourced material may be challenged and removed. Find sources: "Hardnesses of the elements" data page – news · newspapers · books · scholar · JSTOR ( June 2022 ) ( Learn how and when to remove this message )

  4. Drinking water quality standards - Wikipedia

    en.wikipedia.org/wiki/Drinking_water_quality...

    Drinking water quality standards describes the quality parameters set for drinking water. Water may contain many harmful constituents, yet there are no universally recognized and accepted international standards for drinking water. Even where standards do exist, the permitted concentration of individual constituents may vary by as much as ten ...

  5. Analysis of water chemistry - Wikipedia

    en.wikipedia.org/wiki/Analysis_of_water_chemistry

    An EPA scientist samples water in Florida Everglades. Samples of water from the natural environment are routinely taken and analyzed as part of a pre-determined monitoring program by regulatory authorities to ensure that waters remain unpolluted, or if polluted, that the levels of pollution are not increasing or are falling in line with an agreed remediation plan.

  6. Freshwater environmental quality parameters - Wikipedia

    en.wikipedia.org/wiki/Freshwater_environmental...

    Because almost all water bodies are dynamic in their composition, the relevant quality parameters are typically expressed as a range of expected concentrations. They include the natural and man-made chemical , biological and microbiological characteristics of rivers , lakes and ground-waters , the ways they are measured and the ways that they ...

  7. Water quality - Wikipedia

    en.wikipedia.org/wiki/Water_quality

    Individuals interested in monitoring water quality who cannot afford or manage lab scale analysis can also use biological indicators to get a general reading of water quality. One example is the IOWATER volunteer water monitoring program of Iowa , which includes an EPT indicator key.

  8. Hardness scales - Wikipedia

    en.wikipedia.org/wiki/Hardness_scales

    Download as PDF; Printable version; In other projects ... Hardness scales may also refer to: Methods of measuring the deposit formation by hard water.

  9. Harmonised monitoring scheme - Wikipedia

    en.wikipedia.org/wiki/Harmonised_monitoring_scheme

    The Harmonised Monitoring Scheme is a long term river water quality monitoring scheme in the United Kingdom. [1] The term is also used to refer to the long term data sets produced by the scheme. Establishment