arithmeticmean seconddetermination result.Results one decimal. personnelsimultaneously quicksuccession seconddetermination, absolutevalue valueshould morethan averageresult 0.2%.Determination starches:starch itsderivatives emulsionstandard sodium hydroxide solution consumed samplesize. L0g 0.lmol/L standard sodium hydroxide solution consumed ml.Principle: starch emulsion sodiumhydroxide standard solution until neutral consumption volume standardsolution. lawapplies morethan 12mL samples itsderivatives. reagent:determination process, only use analytical grade reagent distilledwater. Standard solution sodiumhydroxide: 0.1mol/L. Potassium hydrogen phthalate: base plain. Phenolphthalein indicator solution: 1g phenolphthalein ethanolsoluble lOOmL,95%. equipmentErlenmeyer flask: volume 250m1 Basicglassware: volume 25m1 Carbonatetitration tube: 50ral Analyticalbalance. Magnetic stirrer. Constant temperature oven: temperature controlled Dry:desiccant haseffectively adequate within perforatedme