Hach DR/700 Procedures Manual page 71

Table 9 Required Containers, Preservation Techniques and
Holding Times
Parameter No./Name
Metals (continued):
35. Mercury
3, 5-8, 10, 12, 13, 19, 20,
22, 26, 29, 30, 32-34, 36,
37, 45, 47, 51, 52, 58-60,
62, 63, 70-72, 74, 75.
Metals, except chromium
VI and mercury.
38. Nitrate
39. Nitrate-nitrite 5
40. Nitrite
41. Oil and grease
42. Organic carbon
44. Orthophosphate
46. Oxygen,
Dissolved Probe
47. Winkler
48. Phenols
49. Phosphorus (elemental) G
50. Phosphorus, total
53. Residue, total
54. Residue, Filterable
55. Residue,
Nonfilterable (TSS)
56. Residue, Settleable
57. Residue, volatile
1
(continued)
2
Container Preservation
P, G HNO
P, G do
P, G Cool, 4 °C
P, G Cool, 4 °C, H
to pH < 2
P, G Cool, 4 °C
G Cool, 4 °C, H
to pH < 2
P, G Cool, 4 °C, HCl or
H SO
2
P, G Filter immediately,
Cool, 4 °C
G Bottle None required
and top
do Fix on site and
store in dark
G only Cool, 4 °C, H
to pH < 2
Cool, 4 °C
P, G Cool, 4 °C, H
to pH < 2
P, G Cool, 4 °C
P, G do
P, G do
P, G do
P, G do
1-53
Maximum
3,4
Holding Time
to pH < 2 28 days.
3
6 months.
48 hours.
SO 28 days.
2 4
48 hours.
SO 28 days.
2 4
do.
to pH < 2
4
48 hours.
Analyze
immediately.
8 hours.
SO 28 days.
2 4
48 hours.
SO 28 days.
2 4
7 days.
7 days.
7 days.
48 hours.
7 days.
5