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FORMALDEHYDE,
3+
Iron (Fe
)
Lead
Manganese
Mercury
Morpholine
Nitrate
Nitrite
Phenol
Phosphate
Silica
Sulfate
Urea
Zinc
Other aldehydes give a positive interference.
STATISTICAL EVALUATION
A single operator repetitively tested samples of two laboratory prepared
solutions, using one DR/700, matched sample cells and two
representative lots of reagent. Testing 200 µg/L concentration solutions,
the standard deviation was ±2.4 µg/L CH
Testing zero concentration samples, the limit of detection was 2.9 µg/L
CH
O. The limit of detection was calculated as three times the standard
2
deviation when testing zero concentration samples (adapted from
Analytical Chemistry, 1980, 52, 2242-2249).
SUMMARY OF METHOD
Formaldehyde reacts with MBTH (3-methyl-2-benzothiazoline
hydrazone) and a developing solution to form a blue color in proportion
to the formaldehyde concentration.
REQUIRED REAGENTS
Formaldehyde Reagent Set (100 Tests) . . . . . . . . . . . . . . . . . . . 22577-00
Includes: (1) 22571-69, (1) 22572-49
Description
Developing Solution For Low
Range Formaldehyde . . . . . 5 mL . . . . . . 500 mL . . . . . . . 22572-49
continued
12 mg/L
100 mg/L
500 mg/L
70 mg/L
0.36 mg/L
1000 mg/L
8 mg/L
1050 mg/L
200 mg/L
40 mg/L
10000 mg/L
1000 mg/L
1000 mg/L
O.
2
Quantity
Per Test
Unit
61-32
Cat. No.
Cat. No.
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