Hach DR2400 - Page 30

Chemical Analysis
Chemical Analysis
Page 30
5940022ChemAnal.fm
27. Hardness P, G HNO
3
to pH<2, H
2
SO
4
to pH<2 6 months
28. Hydrogen ion (pH) P, G None required Analyze immediately
31, 43. Kjeldahl and organic nitrogen P, G Cool 4 °C, H
2
SO
4
to pH<2 28 days
Metals
8
18. Chromium VI P, G Cool, 4 °C 24 hours
35. Mercury P, G HNO
3
to pH<2, Cool 4 °C 28 days
Metals, except boron, chromium VI and
mercury
[3, 5–8, 12, 13, 19, 20, 22, 26, 29, 30,
32–34, 36, 37, 45, 47, 51, 52, 58-60, 62,
63, 70-72, 74, 75]
9
.
P, G HNO
3
to pH<2 6 months
38. Nitrate P, G Cool, 4 °C 48 hours
39. Nitrate-nitrite P, G Cool 4 °C, H
2
SO
4
to pH<2 28 days
40. Nitrite P, G Cool, 4 °C 48 hours
41. Oil and grease G
Cool, 4 °C, HCl or H
2
SO
4
to
pH<2
28 days
42. Organic Carbon P, G
Cool, 4 °C, HCl or H
2
SO4 or
H
3
PO
4
to pH<2
28 days
44. Orthophosphate P, G Filter immediately; Cool, 4 °C 48 hours
46. Oxygen, dissolved probe G Bottle and top None required Analyze immediately
47. Winkler G Bottle and top Fix on site and store in dark 8 hours
48. Phenols G only Cool 4 °C, H
2
SO
4
to pH<2 28 days
49. Phosphorus, elemental G Cool, 4 °C 48 hours
50. Phosphorus, total P, G Cool, 4 °C, H
2
SO
4
to pH<2 28 days
53. Residue, Total P, G Cool, 4 °C 7 days
54. Residue, Filterable P, G Cool, 4 °C 7 days
55. Residue, Nonfilterable (TSS) P, G Cool, 4 °C 7 days
56. Residue, Settleable P, G Cool, 4 °C 48 hours
57. Residue, Volatile P, G Cool, 4 °C 7 days
61. Silica P, PFTE or quartz Cool, 4 °C 28 days
64. Specific Conductance P, G Cool, 4 °C 28 days
65. Sulfate P, G Cool, 4 °C 28 days
66. Sulfide P, G
Cool 4 °C, add zinc acetate plus
sodium hydroxide to pH>9
7 days
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, July 1, 1995, 40 CFR, Part 136.3, pages 643–645. Most organic
tests are not included.
Table 8 Required Containers, Preservation Techniques and Holding Times
1
(continued)
Parameter No./Name Container
2
Preservation
3,4
Maximum Holding
Time
5