The research aims to set up the determination method of heavy metals in tobacco by ICP-MS and analyze its uncertainty. Microwave digest technique is used for decomposition of the tobacco samples. Bi,Sc,Ge and In are e...The research aims to set up the determination method of heavy metals in tobacco by ICP-MS and analyze its uncertainty. Microwave digest technique is used for decomposition of the tobacco samples. Bi,Sc,Ge and In are employed as internal standards to eliminate the interference of the matrix. A method is developed for simultaneous determination of Cr,Cu,As,Cd,Hg and Pb in tobacco from Yunnan Province by ICP-MS,and the measurement uncertainty is evaluated by metrological method. The test results indicate that in the content range of0- 1. 0 g / ml,the linearly dependent coefficient of six elements is 1. 0000,and the RSD achieves 1. 5%- 11%( n = 8). The elemental content in tobacco is as follows: Cr( 2. 92,0. 24) mg / kg,Cu( 3. 64,0. 24) mg / kg,As( 0. 467,0. 025) mg / kg,Cd( 3. 12,0. 15) mg / kg,Hg( 0. 035,0. 006) mg/kg,Pb( 4. 62,0. 36) mg/kg. The uncertainty of sample size,the constant volume of the sample solution can be neglected. It is concluded that the method is accurate,simple,sensitive and rapid.展开更多
In order to set up the digitization indices system of appearance quality of flue-cured tobacco leaves in Qujing. According to the relevant standards,the quantitative analysis on appearance quality of 39 cutter and upp...In order to set up the digitization indices system of appearance quality of flue-cured tobacco leaves in Qujing. According to the relevant standards,the quantitative analysis on appearance quality of 39 cutter and upper tobacco leaf samples which were collected from eight fluecured tobacco production regions of Qujing City,Yunnan Province were carried out in 2011,respectively. The results showed that the difference in evaluation score of appearance quality of flue-cured tobacco in eight regions was not significant. The tobacco leaves had high maturity,high oil content,loose structure and good appearance quality. The scores of appearance quality of flue-cured tobacco in Shizong County and Malong County are higher than other regions. The two regions are suitable for tobacco plantation. The preliminary digitization indices provide reference and guidance to tobacco production and standards system of tobacco leaves base.展开更多
基金Supported by Fund Project of Yunnan Provincial Department of Education(2013Y475)Science and Technology Project of State General Administration for Quality Supervision(2013QK071)
文摘The research aims to set up the determination method of heavy metals in tobacco by ICP-MS and analyze its uncertainty. Microwave digest technique is used for decomposition of the tobacco samples. Bi,Sc,Ge and In are employed as internal standards to eliminate the interference of the matrix. A method is developed for simultaneous determination of Cr,Cu,As,Cd,Hg and Pb in tobacco from Yunnan Province by ICP-MS,and the measurement uncertainty is evaluated by metrological method. The test results indicate that in the content range of0- 1. 0 g / ml,the linearly dependent coefficient of six elements is 1. 0000,and the RSD achieves 1. 5%- 11%( n = 8). The elemental content in tobacco is as follows: Cr( 2. 92,0. 24) mg / kg,Cu( 3. 64,0. 24) mg / kg,As( 0. 467,0. 025) mg / kg,Cd( 3. 12,0. 15) mg / kg,Hg( 0. 035,0. 006) mg/kg,Pb( 4. 62,0. 36) mg/kg. The uncertainty of sample size,the constant volume of the sample solution can be neglected. It is concluded that the method is accurate,simple,sensitive and rapid.
基金Supported by The Science and Technology Project of Hongyun Honghe(Group)Co.,Ltd.(HYHH2012YL04)Talent Project of Yunnan Provincial Department of Science and Technology(2010CI030)
文摘In order to set up the digitization indices system of appearance quality of flue-cured tobacco leaves in Qujing. According to the relevant standards,the quantitative analysis on appearance quality of 39 cutter and upper tobacco leaf samples which were collected from eight fluecured tobacco production regions of Qujing City,Yunnan Province were carried out in 2011,respectively. The results showed that the difference in evaluation score of appearance quality of flue-cured tobacco in eight regions was not significant. The tobacco leaves had high maturity,high oil content,loose structure and good appearance quality. The scores of appearance quality of flue-cured tobacco in Shizong County and Malong County are higher than other regions. The two regions are suitable for tobacco plantation. The preliminary digitization indices provide reference and guidance to tobacco production and standards system of tobacco leaves base.
