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Hardness |
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Methods
Hardness (calcium)
Reference: West, T. S., DSC, Ph.D., Complexometry with EDTA and Related Reagents, 3rd. ed., pp. 46, 164 (1969).
The EGTA method is specific for calcium hardness. The EGTA titrant in alkaline solution is employed with a zincon indicator. Results are expressed as ppm (mg/L) CaCO3.
Shelf-life: eight months. Although the reagent itself is stable, the end point indicator has a limited shelf-life. We recommend stocking quantities that will be used within seven months.
Hardness (total)
References: APHA Standard Methods, 20th ed., pp. 2-37, Method 2340 C (1998). USEPA Methods for Chemical Analysis of Water and Wastes, Method 130.2 (1983).
The total hardness method is applicable to drinking, surface, boiler, and brine waters.
The EDTA titrant is employed in alkaline solution with a calmagite indicator. This method determines the combined calcium and magnesium concentration of a sample. If no magnesium is present, the end point of the titration normally appears sluggish. However, the reagent has been specially formulated to ensure a sharp end point regardless of the presence of magnesium. Results are expressed as ppm (mg/L) CaCO3. |
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| • Click to View MSDS and Kit instructions |
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 Visual Kits |
50-500 ppm as CaCO3
50 ppm / Method: EGTA |
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Cat# |
| Hardness (calcium) Titrets Kit, Shelf-life 8 months |
K-1705 |
| | Increments:
50, 55, 60, 65, 70, 75, 80, 90, 100, 125, 150, 175, 200, 250, 350, 500 ppm | |
| | Kit comes in a cardboard box and contains everything needed to perform 30 tests: thirty ampoules with valve assemblies, Indicator Solution, titrettor, 25 mL sample cup, instructions, and MSDS. | |
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100-1000 ppm as CaCO3
100 ppm / Method: EGTA |
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Cat# |
| Hardness (calcium) Titrets Kit , Shelf-life 8 months |
K-1710 |
| | Increments:
100, 110, 120, 130, 140, 150, 160, 180, 200, 250, 300, 350, 400, 500, 700, 1000 ppm | |
| | Kit comes in a cardboard box and contains everything needed to perform 30 tests: thirty ampoules with valve assemblies, Indicator Solution, titrettor, 25 mL sample cup, instructions, and MSDS. | |
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2-20 ppm as CaCO3
2.0 ppm / Method: EDTA |
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Cat# |
| Hardness (total) Titrets Kit |
K-4502 |
| | Increments:
2.0, 2.2, 2.4, 2.6, 2.8, 3.0, 3.2, 3.6, 4.0, 5.0, 6.0, 7.0, 8.0, 10, 14, 20 ppm | |
| | Kit comes in a cardboard box and contains everything needed to perform 30 tests: thirty ampoules with valve assemblies, titrettor, 25 mL sample cup, instructions, and MSDS. | |
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20-200 ppm as CaCO3
20 ppm / Method: EDTA |
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Cat# |
| Hardness (total) Titrets Kit |
K-4520 |
| | Increments:
20, 22, 24, 26, 28, 30, 32, 36, 40, 50, 60, 70, 80, 100, 140, 200 ppm | |
| | Kit comes in a cardboard box and contains everything needed to perform 30 tests: thirty ampoules with valve assemblies, titrettor, 25 mL sample cup, instructions, and MSDS. | |
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100-1000 ppm as CaCO3
100 ppm / Method: EDTA |
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Cat# |
| Hardness (total) Titrets Kit |
K-4585 |
| | Increments:
100, 110, 120, 130, 140, 150, 160, 180, 200, 250, 300, 350, 400, 500, 700, 1000 ppm | |
| | Kit comes in a cardboard box and contains everything needed to perform 30 tests: thirty ampoules with valve assemblies, titrettor, 25 mL sample cup, instructions, and MSDS. | |
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250-2500 ppm as CaCO3
250 ppm / Method: EDTA |
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Cat# |
| Hardness (total) Titrets Kit |
K-4530 |
| | Increments:
250, 275, 300, 325, 350, 375, 400, 450, 500, 625, 750, 875, 1000, 1250, 1750, 2500 ppm | |
| | Kit comes in a cardboard box and contains everything needed to perform 30 tests: thirty ampoules with valve assemblies, titrettor, 25 mL sample cup, instructions, and MSDS. | |
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Kit Components common to Hardness |
| Description |
Cat# |
| | Sample Cup Pack, 25 mL (6 ea) | A-0013 |
| | Titrettor Pack (1 ea) | A-0053 |
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