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PHOSPHONATES,
SAMPLING AND STORAGE
Collect sample in clean plastic or glass bottles that have been cleaned
with 1:1 Hydrochloric Acid Solution and rinsed with demineralized
water. Do not use a commercial detergent. If prompt analysis is
impossible, adjust the pH to 2 or less with about 2 mL of sulfuric acid,
ACS, per liter of sample. Store the sample at 4
Preserved samples can be stored at least 24 hours. See Section 1 for
more information on dilution factors, cleaning instructions, etc.
INTERFERENCES
When testing a 5-mL sample volume, the following may interfere when
present in concentrations exceeding those listed below:
Aluminum
Benzotriazole
Bicarbonate
Bromide
Calcium
CDTA
Chloride
Chromate
Copper
Cyanide* 1
Diethanoldithiocarbamate
EDTA
Iron
Nitrate
NTA
Orthophosphate
Silica
Silicate
Sulfate
Sulfite
Thiourea
*The UV digestion should be increased to 30 minutes.
The interference levels will decrease as the sample size increases. For
example, copper does not interfere at or below 100 mg/L for a 5.00 mL
sample. If the sample volume is increased to 10.00 mL, copper will
begin to interfere above 50 mg/L.
continued
100 mg/L
10 mg/L
1000 mg/L
100 mg/L
5000 mg/L
100 mg/L
5000 mg/L
100 mg/L
100 mg/L
100 mg/L
50 mg/L
100 mg/L
200 mg/L
200 mg/L
250 mg/L
15 mg/L
500 mg/L
100 mg/L
2000 mg/L
100 mg/L
10 mg/L
81-11
o
o
C (39
F) or below.
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