vigorously for about 1/2 min. Remove the closure; remove any external contaminant that may be
present in the threads of the sample container by washing with filtered flushing fluid ensuring that none of
the washings enter the container.
Screw the closure on the container. If the closure is not clean, rinse thoroughly with filtered flushing fluid
and dry with compresses air before use. Slip a length of plastic tubing snugly over the house barb.
- If the closure will not fit the original sample container, shake the original container briefly and quickly
transfer the sample to an appropriate container that has been rinsed. Tighten the dispensing cap or
plug on the container.
- Assemble the receiving flask, preweighed filter(s) and funnel as a unit, and place on the pan of the
support. Snap the support shelf on the support apparatus. The shelf should be positioned
approximately 25 to 50 mm above the top of the funnel. Secure a grounding clip and wire to the
container support and electrically ground in series.
Calculate and Report the Results.
Subtract the initial weight of the test membrane filter (W1) from the final weight (W2).
Subtract the initial weight of the control membrane filter (W3) from the final weight (W4).
Divide the correct weight of contaminant, (W2 - W1) - (W4 - W3), by the volume in liters of the sample
filtered.
Report the results to the nearest 0.01 mg/L.
Report the volume of the sample used in the test.
Perform PMCS on Applicable Equipment.
Apparatus and containers will be rinsed with a portion of the product being sampled to ensure that the
sample is not contaminated with the previous material, unless otherwise specified in the test procedures.
Soaking and rinsing material will be discarded.
Sampling apparatus will be cleaned immediately after use and stored so it will remain clean until after
next use.
Sampling area should remain clean to prevent contamination of the intended sample.
All testing apparatus must be cleaned, prepared for next use, and properly stored as soon after
completing of the test method is practicable. Consult the test method for apparatus manual for additional
information.
Clean up all spills immediately. Dispose of hazardous materials and hazardous waste in accordance with
laboratory standard operating procedures. Report all hazardous material and hazardous waste spills
immediately. Be familiar with, and know the location of material safety data sheets for all hazardous
materials present in the workplace.
3-7
QM 5183
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