Hach POCKET COLORIMETER II Instruction Manual page 26

Analysis systems

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Phosphorus, Reactive,

For highly turbid or colored samples, add the contents of one Phosphate

Pretreatment Powder Pillow to 25 mL of sample. Mix well. Use this solution

(instead of the blank) to zero the instrument.

The following may interfere when present in concentrations exceeding those

listed below

Aluminum

Arsenate

Chromium

Copper

Hydrogen Sulfide

Iron

Nickel

pH, excess

buffering

continued

Table 3

Greater than 200 mg/L

Interferes at any level.

Greater than 100 mg/L

Greater than 10 mg/L

Interferes at any level

Greater than 100 mg/L

Greater than 300 mg/L

Highly buffered samples or extreme sample pH may exceed the

buffering capacity of the reagents and require sample

pretreatment. pH 2–10 is recommended.

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