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8.0 QUALITY CONT <br /> 8.1 All quality control data must be maintained.and available for easy <br /> reference or inspection. <br /> 8.2 All pH determinations must be performed in duplicate. <br /> 8.3 Each batch of pH paper must be calibrated versus certified pH <br /> buffers or a pH meter which has been calibrated with certified pH buffers. <br /> 9.0 METHOD PERFORMANCE <br /> 9.1 No data provided. <br /> 10.0 REFERENCES <br /> 10.1 None required. <br /> 9041 — 3 <br /> Revision 0 <br /> Date Sep tember 19g6 <br />