The words contained in this file might help you see if this file matches what you are looking for:
...Ph measurement sop purpose accurate determinations require several important maintenance liquid samples calibration and processes improper storage rinse the electrode with pure water or cleaning of can cause inaccurate readings which immerse tip in sample stir gently use a impact quality safety magnetic stirrer wait until reading is stable when digits do not change this standard operating procedure to for at least seconds before recording establish all necessary steps store care residues specific attention given address differences are removed measuring solid repeat additional materials note semi it possible create meter slurry deionized perform measure e g di reverse osmosis ro distilled ments as above follow approved methods buffers solution beakers knife auger make hole some plate bars optional electrodes have an integrated blade these cases simply insert probe into setup you ensure preparation junction coverage by placing cm remove protective cap from inspect any scratches cracks i...