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OWML: QA/QC

Quality Assurance/Quality Control Manual: Ohio Water Microbiology Laboratory

 

Table 2.  Acceptance criteria for laboratory water quality-assurance checks. [Adopted from USEPA (1978), APHA (2005), and ASTM (1999); NA is not applicable]

 

DEIONIZED

MILLIQ

ACTION

warning

shut down

shut down

Specific conductance (ms/cm)

3

5

2

Turbidity

1

5

1

Heterotrophic plate count (colonies/mL)

NA

NA

<1

Total organic carbon (mg/L)

0.5

10

NA

Nutrients individual (mg/L)

0.1

1

NA