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《China Pulp & Paper Industry》 2005-08
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Spectrophotometeric determination of silicon in rice straw and black liquor after rice straw alkaline pulping by silicomolybdate blue

TONG Guo-lin, LU Qi, WANG Yun, ZHOU Cai-hong(School of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China)  
The silicon in rice straw and black liquor after alkaline pulping were determined by silicomolybdate blue spectrophotometeric method.There is a peak at the 813nm and the ingredients in black liquor had no effect on the measuring result of the silicomolybdate blue spectrophotometericmethod. pH value has a great influence on the solubility of silicon dioxide and there is an obvious inflexion at pH 10.3. In the cooking process,the cooking black liquor were compared by both weight and silicomolybdate blue spectrophotometeric methods. The results indicate that thesilicon content in black liquor and rice straw were very similar by both methods. The silicomolybdate blue spectrophotometeric method issimple in operation, short in testing time and accurate and reliable in test results.
【Fund】: 南京林业大学人才基金资助课题。
【CateGory Index】: X793
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