1-54
Table 9 Required Containers, Preservation Techniques and
Holding Times
1
(continued)
Maximum
Parameter No./Name Container
2
Preservation
3,4
Holding Time
5
Metals (continued):
61. Silica P do 28 days.
64. Specific conductance P, G do do.
65. Sulfate P, G do do.
66. Sulfide P, G Cool, 4 °C add 7 days.
zinc acetate plus
sodium hydroxide
to pH >9.
67. Sulfite P, G None required Analyze
immediately
68. Surfactants P, G Cool, 4 °C 48 hours.
69. Temperature P, G None required Analyze
immediately
73. Turbidity P, G Cool, 4 °C 48 hours.
1
This table was taken from Table II published in the
Federal Register
, October 1, 1991, 40 CFR,
Part 136.3, pages 308-309.
2
Polyethylene (P) or glass (G).
3
Sample preservation should be performed immediately upon sample collection. For composite
chemical samples each aliquot should be preserved by maintaining at 4 °C until compositing and
sample splitting is completed.
4
When any sample is to be shipped by common carrier or sent through United States Mails, it
must comply with the Department of Transportation Hazardous Material Regulations (49 CFR
Part 172). The person offering such material for transportation is responsible for ensuring such
compliance. For the preservation requirements of Table II, the Office of Hazardous Materials,
Materials Transportation Bureau, Department of Transportation has determined that Hazardous
Materials Regulations do not apply to the following materials: Hydrochloric acid (HCl) in water
solutions at concentrations of 0.04% by weight or less (pH about 1.96 or greater); Nitric acid
(HNO
3
) in water solutions at concentrations of 0.15% by weight or less (pH about 1.62 or greater);
Sulfuric acid (H
2
SO
4
) in water solutions at concentrations of 0.35% by weight or less (about pH
1.15 or greater); and Sodium hydroxide (NaOH) in water solutions at concentrations of 0.080% by
weight or less (pH about 12.30 or less).
5
Samples should be analyzed as soon as possible after collection. The times listed are the
maximum times that samples may be held before analysis and still be considered valid. Samples
may be held for longer periods only if the permittee, or monitoring laboratory, has data on file to
show that the specific types of samples under study are stable for the longer time, and has
received a variance from the Regional Administer under §136.3(e). Some samples may not be
stable for the maximum time period given in the table. A permittee, or monitoring laboratory, is
obliged to hold the sample for a shorter time if knowledge exists to show that this is necessary to
maintain sample stability. See §136.3(e) for details.
6
Should only be used in the presence of residual chlorine.
7
Maximum holding time is 24 hours when sulfide is present. Optionally all samples may be
tested with lead acetate paper before pH adjustments in order to determine if sulfide is present. If
sulfide is present, it can be removed by the addition of cadmium nitrate powder until a negative
spot test is obtained. The sample is filtered and then NaOH is added to a pH of 12.
8
Samples should be filtered immediately on-site before adding preservative for dissolved metals.
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