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5.4.1 Optional procedure for removing sulfide
I
f a rotten egg smell is detected after adding reagent #1, sulfide is present at interfering levels.
Complete the following steps to remove the sulfide before beginning the test procedure:
1.
Tear off a small piece of cotton and form a ball the size of a pea.
2.
Saturate the cotton with a few drops of lead acetate. Squeeze the excess liquid out of the
cotton, leaving it damp.
3.
Press the saturated cotton ball into the small opening of the reaction bottle cap from the
bottom. Be sure that the cotton is firmly in place and that a gap remains between the
cotton and the top surface of the cap.
4.
Insert the test strip as detailed in step 1 of the 0–500 or 0–4000 ppb test procedure and
continue with the test.
Note:
The lead acetate must not touch the test strip!
Always wear gloves or wash hands thoroughly after handling lead acetate.
Antimony
> 250 ppb
Tellurium
Likely to interfere, but not tested.
Acidity
< pH 5. Do not acid-preserve samples. If
samples are below pH 5, adjust pH to
between 5 and 6 before beginning test.
Nitric acid
Interferes with the reduction step. Do not use
samples preserved with nitric acid because
low results will be observed. If samples must
be preserved, use HCl or sulfamic acid to
adjust sample to pH 2. Adjust to pH 5–7
before running the test.
1
See
section 5.4.1 on page 38
for information on removing sulfide.
Table 3 Non-interfering substances
Ion or substance
Concentration
Hardness
1000 ppm as CaCO
3
Alkalinity
1000 ppm as CaCO
3
Iron
100 ppm
Temperature
10 to 40 °C (50 to 104 °F)
Table 2 Interfering substances
Ion or Substance
Concentration
Содержание Eclox
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