Objective Discussion on the dilution of sulfur dioxide blank solution for determination of high-concentration sulfur dioxide samples. Methods Several experiments are done to Sulfur dioxide standard solution as sample. For the high concentration of sulfur dioxide exceeds the upper limit of the standard curve of absorbance (referred to as the out of sample, the same below), diluted with sulfur dioxide reagent blank solution (referred to as the blank solution, the same below) and then determination. Results The experimental results show that the absorbance of the sample, preferably not more than the upper limit of the standard curve is 0.100. Conclusion The dilution ratio should not be greater than 2 times; shake well placed 4-5 minutes after the determination as well; sulfur dioxide dilution and measured were lower than sulfur dioxide due to overloading, the samples should be more than the maximum absorbance value according to appropriately increase the sample number measured 4%-8%, make the results more close to the actual value.

overrun sample  /  blank solution  /  dilution  /  sulfur dioxide  /  standing time