Sampling

Question 1

What are the components of EPA recommended preservations for samples

Answer 1

Constituent
Container
Preservation method
Max holding time

Question 2

How do you preserve acid/alkalinity samples?

Answer 2

Container: P, FG, G
Preservation method: < 6 deg C
Max holding time: 14 days

Question 3

Preservation of ammonia samples

Answer 3

Container: P, F, G
Preservation method: <6 deg C
Max holding time: 28 days

Question 4

Preservation of BOD samples

Answer 4

Container: P, F, G

Preservation method: add H2SO4 to pH <2; cool <6 degrees

Max holding time: 48 hours

Question 5

Preservation of COD samples

Answer 5

Container: P, FP, G

Preservation method: add H2SO4 to pH <2; cool to < 6 deg C

Max holding time: 28 days

Question 6

Preservation of chloride samples

Answer 6

Container: P, FG, G
Preservation method: none
Max holding time: 28 days

Question 7

Preservation of chlorine, total residual

Answer 7

Container: P, G
Preservation method: none
Max holding time: within 15 minutes

Question 8

Preservation of DO

Answer 8

Container: glass, bottle and top
Preservation method: none
Max holding time: 15 minutes

Question 9

Preservation of oil and grease

Answer 9

Container: Glass

Preservation method: <6 deg C; HCL or H2SO4 until pH <2

Max holding time: 28 days

Question 10

Preservation of pH

Answer 10

Container: P, FP, Glass
Preservation method: none
Max holding time: within 15 minutes

Question 11

Phenols preservation

Answer 11

Container: glass
Preservation method: <6 deg C; H2SO4 to ph <2
Max holding time: 28 days

Question 12

Phosphorous preservation

Answer 12

Container: P, FP, Glass
Preservation method: <6 deg C
Max holding time: 28 days for total

Question 13

Total nitrogen preservation

Answer 13

Container: P, FP, G
Preservation method: <6 deg C; H2SO4 to pH <2
Max holding time: 28 days

Question 14

Turbidity sample preservation

Answer 14

Container: P, FP, G
Preservation method: <6 deg
Max holding time: 48 hours