Sample Containers, Preservation Techniques, and Holding Times

Question 1

Coliform; total, fecal, and E. Coli

Answer 1

Preservation: Cool, <10C, .008% Na2S2O3

Max Holding Time: 8 hours

Question 2

Acidity

Answer 2

Preservation: < or = 6C

Max Holding Time: 14 days

Question 3

Alkalinity

Answer 3

Preservation: < or = 6C

Max Holding Time: 14 days

Question 4

Ammonia

Answer 4

Preservation: < or = 6C, H2SO4 to pH <2

Max Holding Time: 28 days

Question 5

BOD

Answer 5

Preservation: < or = 6C

Max Holding Time: 48 hours

Question 6

BOD, carbonaceous

Answer 6

Preservation: < or = 6C

Max Holding Time: 48 hours

Question 7

COD

Answer 7

Preservation: < or = 6C; H2SO4 to pH <2

Max Holding Time: 28 days

Question 8

Oil and Grease

Answer 8

Preservation: < or = 6C; HCL or H2SO4 to pH <2

Max Holding Time: 28 days

Question 9

Winkler DO

Answer 9

Preservation: Fixed immediately, store in dark

Max Holding Time: 8 hours

Question 10

Total Solids, Dissolved solids, Total Suspended Solids

Answer 10

Preservation: < or = 6C

Max Holding Time: 7 days

Question 11

Settleable Solids

Answer 11

Preservation: < or = 6C

Max Holding Time: 48 hours

Question 12

Volatile Solids

Answer 12

Preservation: < or = 6C

Max Holding Time: 7 days

Question 13

Turbidity

Answer 13

Preservation: < or = 6C

Max Holding Time: 48 hours

Question 14

Chlorine, total residual

Answer 14

Analyze within 15 minutes

Question 15

pH

Answer 15

Analyze within 15 minutes

Question 16

Dissolved Oxygen, Probe

Answer 16

Analyze within 15 minutes

Question 17

Phosphorous, total

Answer 17

Preservation: < or = 6C; H2SO4 to pH <2

Max Holding Time: 28 days

Question 18

Kjeldahl and organic N

Answer 18

Preservation: < or = 6C; H2SO4 to pH <2

Max Holding Time: 28 days