Hardness
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Methods
Hardness (calcium) Range: 2-20 ppm as CaCO3
MDL: 2.0 ppm / Method: EDTA
Reference: West, T. S., DSC, Ph.D., Complexometry with
Cat#
EDTA and Related Reagents, 3
rd.
ed., pp. 46, 164 (1969).
Hardness (total) Titrets Kit K-4502
The EGTA method is specific for calcium hardness. The
Increments:
EGTA titrant in alkaline solution is employed with a zincon
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
indicator. Results are expressed as ppm (mg/L) CaCO
Kit comes in a cardboard box and contains everything needed to perform 30
3
.
tests: thirty ampoules with valve assemblies, titrettor, 25 mL sample cup,
Shelf-life: eight months. Although the reagent itself
instructions, and MSDS.
is stable, the end point indicator has a limited shelf-
life. We recommend stocking quantities that will be
Range: 20-200 ppm as CaCO
3
MDL: 20 ppm / Method: EDTA
used within seven months.
Cat#
Hardness (total) Titrets Kit K-4520
Hardness (total)
Increments:
References: APHA Standard Methods, 20
th
ed., pp. 2-37,
20, 22, 24, 26, 28, 30, 32, 36, 40, 50, 60, 70, 80, 100, 140, 200 ppm
Method 2340 C (1998). USEPA Methods for Chemical
Kit comes in a cardboard box and contains everything needed to perform 30
tests: thirty ampoules with valve assemblies, titrettor, 25 mL sample cup,
Analysis of Water and Wastes, Method 130.2 (1983).
instructions, and MSDS.
The total hardness method is applicable to drinking,
surface, boiler, and brine waters.
Range: 100-1000 ppm as CaCO
3
MDL: 100 ppm / Method: EDTA
The EDTA titrant is employed in alkaline solution
Cat#
with a calmagite indicator. This method determines the
Hardness (total) Titrets Kit K-4585
combined calcium and magnesium concentration of a
Increments:
sample. If no magnesium is present, the end point of
100, 110, 120, 130, 140, 150, 160, 180, 200, 250, 300, 350, 400,
500, 700, 1000 ppm
the titration normally appears sluggish. However, the
Kit comes in a cardboard box and contains everything needed to perform 30
reagent has been specially formulated to ensure a tests: thirty ampoules with valve assemblies, titrettor, 25 mL sample cup, instruc-
sharp end point regardless of the presence of magne-
tions, and MSDS.
sium. Results are expressed as ppm (mg/L) CaCO
3
.
Range: 250-2500 ppm as CaCO
3
MDL: 250 ppm / Method: EDTA
Visual Kits
Cat#
Hardness (total) Titrets Kit K-4530
Range: 50-500 ppm as CaCO
3 Increments:
MDL: 50 ppm / Method: EGTA
250, 275, 300, 325, 350, 375, 400, 450, 500, 625, 750, 875, 1000,
1250, 1750, 2500 ppm
Cat#
Hardness (calcium) Titrets Kit, Shelf-life 8 months K-1705
Kit comes in a cardboard box and contains everything needed to perform 30
tests: thirty ampoules with valve assemblies, titrettor, 25 mL sample cup, instruc-
Increments:
tions, and MSDS.
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
Kit Components common to Hardness
tests: thirty ampoules with valve assemblies, Indicator Solution, titrettor,
25 mL sample cup, instructions, and MSDS.
Description Cat#
Sample Cup Pack, 25 mL (6 ea) A-0013
Range: 100-1000 ppm as CaCO
3
Titrettor Pack (1 ea) A-0053
MDL: 100 ppm / Method: EGTA
Cat#
Instructions are posted on our website.
Hardness (calcium) Titrets Kit , Shelf-life 8 months K-1710
If no shelf-life is listed for a product, then the shelf-life is at least 2 years.
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.
43
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