Total Hardness Test Strips 90-450 ppm EM Quant (1 PK of 100)

Purchase Total Hardness Test Strips 90-450 ppm EM Quant (1 PK of 100)

Total Hardness Test Strips 90-450 ppm EM Quant  (1 PK of 100) MSDS (Material Safety Data Sheet)

10025, 10046 EM Quant® Total Hardness Test

Purchase Total Hardness Test Strips 90-450 ppm EM Quant (1 PK of 100)

  • Gallade Part#: 10046-1
  • Mfr Part#: 10046-1
  • Brand: EMD Chemicals EM Science
  • Container: 1 PK of 100 Strips

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  • EM Quant® Total Hardness Test, Catalog No. 10025, 10046

    Test strips for determining water hardness

    General

    Water hardness is caused by the presence of alkaline earths, primarily calcium and magnesium. Total hardness is measured as the sum of all calcium and magnesium ions. One way of expressing hardness is in terms of milligrams of calcium oxide (CaO) per liter of water. See the table below for conversion into other units.

    The test can be used for purposes so numerous that we cannot possibly deal with them all. Knowing how hard the water is in a particular area enables detergents to be used more economically, thereby cutting down on pollution. The test can also be used to check the efficiency of domestic or industrial water softeners. Coffee and espresso machines used in the catering industry use ion exchangers to soften water, as do dishwashers. Service engineers and commercial operators of such machines thus have a simple function test at their disposal.

    Modern steam irons can be used with tap water up to 20·e. Checking the water hardness with a test strip means that distilled water can be used to dilute tap water if it is found to be too hard.

    Fish breeders, etc., can quickly measure water hardness in springs and streams and check whether water is becoming too hard through evaporation.

    Total hardness rapid tests can also be applied in dentistry to measure the alkaline earth ion content of saliva and so identify patients predisposing to dental disease.

    Measuring the alkaline earth ions in the secretion of a pregnant mare is an accurate way of fixing the date on which the foal will be born.

    Principle of the Method

    The method is based on a complexometric titration in which the calcium and/or magnesium ions present in the water form a complex with Titriplex IIIâ (ethylene dinitrilotetraacetic acid disodium salt).

    Graduation

    5 - 9 - 18 - 26 ·e: Catalog number 10025

    6 - 12 - 19 - 25 - 30 ·e: Catalog number 10046

    Directions

    1. Immerse a test strip in the water sample (not running water) for 1 second, so that all the reaction zones are thoroughly moistened.
    2. Remove the test strip,gently shake off excess water, wait 1 minute and compare the reaction zones with the color scale.

    Notes

    Do not hold the reaction zones under running water and do not touch the reaction zones.

    If more precise total hardness results are required, we recommend the use of our Aquamerck® titrimetric tests. Depending on the test selected, thesegive results to the nearest 1.25·e or 0.25·e

    Evaluation

    Catalog Number 10025

    Four reaction zones are sealed onto each strip. Evaluation is based on the number of zones which change color, as follows:

    Total hardness

    Number of zones sum of alkaline earth ions

    Green Red-violet ·e mmol/l
    4 0 below 4 below 0.5
    3 1 above 5 above 0.7
    2 2 above 9 above 1.3
    1 3 above 18 above 2.5
    0 4 above 26 above 3.8

    Catalog Number 10046

    Five reaction zones are sealed onto each strip. Evaluation is based on the number of zones which change color as follows:

    Total hardness

    Number of zones sum of alkaline earth ions

    Green Red-violet ·e mmol/l
    5 0 below 4 below 0.5
    4 1 above 6 above 0.9
    3 2 above 12 above 1.8
    2 3 above 19 above 2.7
    1 4 above 25 above 3.6
    0 5 above 30 above 4.5

    Units

    "Water hardness" is now a familiar concept in water analysis. However, the units used to specify water hardness differ from country to country. The following conversion tablegives a summary of the international units used.

    The statutory unit for water hardness, based on the Sl system, is the sum of alkaline earth ions expressed in mmol/l.

    Conversion Table

      Alkaline
    earth ions
    mmol/l
    Alkaline
    earth ions
    meq/l
    German
    degree
    ·d
    ppm
    CaCO3
    Engl.
    degree
    ·e
    French
    degree
    ·f
    1 mmol/l alkaline earth ions 1.00 2.00 5.60 100.00 7.02 10.00
    1 meq/alkaline earth ions 0.50 1.00 2.80 50.00 3.51 5.00
    1 German degree 0.18 0.36 1.00 17.80 1.25 1.78
    1 ppm CaCO3 0.01 0.02 0.06 1.00 0.07 0.10
    1 English degree 0.14 0.29 0.80 14.30 1.00 1.43
    1 French degree 0.10 0.20 0.56 10.00 0.70 1.00

    Package Size

    10025, 10046 EM Quant® 100 Test Strips for determining

    Total Hardness Test water hardness

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