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4 <br /> Page ..q_ <br /> Jr� <br /> XIV. Good Laboratory Practices <br /> Good laboratory practices are followed to prevent contamination of <br /> samples and standards. This includes the careful cleaning of glassware, <br /> and the use of disposable labware and containers when practical. <br /> The deionized water is monitored by an automatic shut-off valve (at a <br /> set resistance of 500,000 ohms), checked monthly for pH and by a <br /> standard plate count, and tested annually for inhibitory residue <br /> suitability and heavy metals (to include lead, cadmium, chromium, copper, <br /> nickel and zinc). <br /> The analytical balances should be certified once a year by a qualified <br /> specialist. <br /> The pH meter should be standardized on the day of use with two (2) buffer <br /> solutions (pH 4, 7 and/or 10). <br /> The conductivity meter should be standardized once a month with <br /> 0.01 N KC1 solution. <br /> The turbidity meter should be standardized with standards before use. A <br /> 4.0 NTU standard, made by EPA procedures, should be checked once a month <br /> against the commercial standard. <br /> ~ The lab director should be notified immediately if any sign of <br /> malfunction occurs in any instrument so that he can decide if a <br /> qualified serviceman should be consulted. <br /> In accordance with current regulations, hazardous materials are <br /> clearly labeled and Material Data Safety Sheets are available for <br /> f employee inspection. <br /> Y <br /> RECEIVED i n; 3 MIZO <br />