Study on the Factors That Affect the Slope of Sulfur Dioxide in Determination of Air Sulfer Dioxide

Abstract：Objective:To know the factors that affect the slope of the sulfur dioxide standard. And to study how the developing temperature and developing time effect the slope of standard curve. Most importantly,attain the most appropriate time in the these two methods when the temperature is 10℃or 15℃. Methods:The standard curves were drew in different conditions,and a lot of data about the slope were got ,then the arithmetic mean. Was calculate in which mercury tetrachloride salt in 10℃,15℃draw 25 min,30 min,35 min gradient of the standard curve of three;formaldehyde in 10℃,15℃draw 35 min,40 min, 45 min gradient of the standard curve of three. At the same time,the temperature gradient of the same color under the standard curves of each method to do three. Results:Tetrachloromercurate salt:when the developing temperature was 10℃,the slope of the curve under the conditions of 25 min in developing time was 0.057 893 closer to the standard provisions between“0.075 0-0.075 8”;when the developing temperature was 15 ℃,the slope of the curve under the conditions of 25 min in developing time was 0.564 15 closer to the standard provisions between“0.075 0-0.075 8”.Formaldehyde method:when the developing temperature was 10℃,the slope of the curve under the conditions of 45 min in developing time was 0.026 917 closer to the standard provisions between“0.041-0.047”;when the developing temperature was 15℃,the slope of the curve under the conditions of 35 min in developing time was 0.026 707 closer to the standard provisions between“0.041-0.047”.Conclusion:Tetrachloro mercury salt at 10℃for the best time of 25 min,at 15℃for the best time of 30 min;formaldehyde in 10℃on the best time of 45 min,the best was at 15℃color time of 35 min.