Table 2

TABLE 2
REQUIRED CONTAINERS, PRESERVATION TECHNIQUES, AND HOLDING TIME FOR SOIL OR SEDIMENT SAMPLES
PARAMETER SAMPLE CONTAINER1 SAMPLE PRESERVATION2,3 RECOMMENDED HOLDING TIMES4
Cyanide 500-mL P Cool, 4°C 14 days
Sulfide 500-mL P Cool, 4°C 7 days
Oil & grease, Total petroleum hydrocarbons 500-mL G Cool, 4°C 28 days
Nutrients/TOC 500-mL P Cool, 4°C 28 days
Metals (except Mercury) 500-mL P None required 6 months
Semivolatile organics,
pesticides, etc.
500-ml G with Teflonlined Lid Dark, Cool, 4°C Extraction – 14 days
Analysis- within 40 days of extraction
Volatile organics 125-ml amber  with Teflonlined lid Dark, Cool, 4°C 14 days
Mercury 500-mL P Cool, 4°C 28 days