Weigh accurately a sample 1g, dissolved i50ml water, with sodium hydroxide solution or acetic acid to adjust the pH to 6.9 to 7.2. The gradual addition of basic lead acetate solution, to no longer feel there is progress = step precipitation occurs. After adding calcium lignosulphonate water to 250.0ml mix well: the mixture was centrifuged; moved into the supernatant 10ml 50ml volumetric flask, and then diluted to about 35rnl. Plus disodium hydrogen phosphate solution 2ml or more, ˉ to no precipitation occurs. Diluted to 50ml after mixing.
Centrifuged at 2100 times gravity 10min. 5ml of the supernatant into a suction tube, add notes reagent solution 5ml, and mixed. The mouth of the tube loosely
stuffed 40min ± 10s placed in a boiling water bath. After heating, the tube immediately in cold water in the cooling calcium lignosulphonate. Plus 2.5% potassium iodide solution 2ml and 2mol / L sulfuric acid 1.5ml. After thoroughly mixed with 0.005mol / L sodium thiosulfate, using starch indicator, record the consumption volume of anger. Repeat, recording glucose standard solution (glucose standard solution 5rnl plus copper reagent 5ml) the consumption volume of ‰. Above every titration, and with 5ml of calcium lignosulphonate and bml copper reagent solution as a blank, blank titration, set the consumption volume of ‰.
2 spindle at 20r/min by a Brookfield viscometer A.Packing: PP woven bag lined with plastic film topical double packaging, net weight 25kg / bag Storage: Store
in a dry and ventilated place, should pay attention to moisture and moisture. Long-term storage is not bad, Calcium lignosulphonate pulp and paper industry, if agglomeration, crushing or dissolving the transport does not affect the results: This product non-toxic, non-flammable and explosive dangerous goods department.
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