Method Performance - Hach POCKET COLORIMETER II Instruction Manual

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Silica

Silicate

Turbidity (large

amounts) or color

Zinc

Method Performance

Typical Precision (95% Confidence Interval):

1.0 ± 0.04 mg/L

Estimated Detection Limit:

EDL = 0.02 mg/L

Table 3 (Continued)

Greater than 50 mg/L

Greater than 10 mg/L

May cause inconsistent results because the acid in the powder

pillow may dissolve some of the suspended particles and

because of variable desorption of orthophosphate from the

particles. For highly turbid or colored samples, add the contents

of one Phosphate Pretreatment Powder Pillow (Cat. No. 14501-

99) to 25 mL of sample. Mix well. Use this solution to zero the

instrument.

Greater than 80 mg/L

1—27

Phosphorus, Reactive,

continued

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