Water Microbiology Laboratory Evaluation Form - Illinois Department Of Public Health Page 10

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WATER MICROBIOLOGY LABORATORY EVALUATION FORM
State of Illinois
Illinois Department of Public Health
GENERAL LABORATORY PRACTICES (cont’d)
5. Sample Containers
a. Stock sodium thiosulfate solution free of turbidity (465.370f).
______
b. 0.1 mL of 3% solution sodium thiosulfate added to sample containers prior to sterilization to neutralize
up to 5 mg/L (465.370f).
______
QC c. At least one bottle per lot or batch of sterilized bottles prepared with sodium thiosulfate checked for
a sufficient amount of dechlorinating agent (465.400k).
______
QC d. Sterility of each lot or batch of sample bottles determined using non-selective broth; broth checked for
growth at 24 and 48 hours (465.400j).
______
QC e.
Pre-calibrated sample containers checked by measuring the volume of one container per lot with
class A graduated cylinder. ±2.5% tolerance (465.400l).
______
6. Glassware Washing
a. Distilled or deionized water used for final rinse (465.400h).
______
b. Detergent designed for laboratory use (465.400h).
Brand _____________________________
______
QC c. Inhibitory residue test performed on clean glassware before initial use of detergent and whenever
different formulation, lot number, container or washing procedure (465.400h).
______
QC d. Piece of glassware or plastic ware from each batch checked with bromothymol blue; corrective action
taken if necessary (465.400i).
______
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