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2340 Hardness (1997) (20th Edition)

2340 Hardness (1997) (20th Edition)

Approved by SM Committee: 1997

[E] - EPA Approved

You Pay: $75.00 (free to Standard Methods Online subscribers)


Two methods are presented for determining hardness. Method 2340B, hardness by calculation, is applicable to all waters and yields the higher accuracy. If a mineral analysis is performed, hardness by calculation can be reported. Method 2340C, the EDTA titration method, measures the calcium and magnesium ions and may be applied with appropriate modification to any kind of water. The procedure described affords a means of rapid analysis. Note the error in the equation on page 2-37. The number should read 4.118.


[E] [R] [N] Product
       A. Introduction
[E]      B. Hardness by Calculation
[E]      C. EDTA Titrimetric Method

Companion Products

[E] [R] [N] Product Price  
[E]     3500-Ca Calcium (1997) $75.00
[E] [R]   3500-Mg Magnesium $0.00