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 (1998), and ASTM (1999); NA is not applicable; constituents highlighted in gray are no longer required tests]

	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
Sodium (mg/L)	0.1	1	NA
Nutrients individual (mg/L)	0.1	1	NA
Heavy metals, individual (Cd, Cr, Cu, Ni, Pb, Zn) (mg/L)	1	10	NA
Other trace elements (mg/L)	3	50	NA

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