Hardness, Total
Hardness, Total
Hardness_PT_ULow_CPZ_Eng_Ody.fm Page 3 of 6
Interferences
Interference studies were conducted at various hardness levels between 0 and
500 µg/L as CaCO
3
. Various cations and anions were evaluated at levels in the
range appropriate to ultra pure water applications. An ion is said to interfere
when the resulting concentration is changed by ±10%.
13. Flush the Pour-Thru
cell with an additional
50-mL of ultra-pure
water.
Table 1 Negative Interference
Ion Level above which the ion interferes (µg/L)
Aluminum 150
Sodium 79,000
Table 2 Positive Interference
Ion Level above which the ion interferes (µg/L)
Copper 250
Silicon 1000
Table 3 No Interference
Ion Highest Concentration Tested (µg/L)
Potassium 1000
Ammonium 1000
Formaldehyde 47,000
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