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USP37-NF32ÖÐÓй涨TiO2ÖÐË®ÈÜÎﺬÁ¿²â¶¨µÄ·½·¨£¨¼ûÏ·½£©£¬µ«ÊÇÎÒ²»Ã÷°×ΪʲôҪ¼ÓÂÈ»¯ï§£¿ÄÄλӢÐÛ¿ÉÒÔ°ïæ½â´ð£¿ WATER-SOLUBLE SUBSTANCES Sample suspension: Suspend 4.0 g TiO2 in 50 mL of water,mix, and allow to stand overnight. Analysis: Transfer the Sample suspension to a 200-mL volumetric flask, add 2 mL of ammonium chloride TS, and mix. If the Titanium Dioxide does not settle, add another 2-mL portion of ammonium chloride TS. Allow the suspension to settle, dilute with water to volume, mix, and pass through a double thickness of fine-porosity filter paper, discarding the first 10 mL of filtrate. Collect 100 mL of the clear filtrate, transfer to a tared platinum dish, evaporate on a hot plate to dryness, and ignite at a dull red heat to constant weight. Acceptance criteria: The residue weighs NMT 5 mg (NMT 0.25%). |
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