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PbO-FeOx-CaO-SiO2-ZnO挥发性高铅渣的挥发动力学 被引量:7
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作者 崔雅茹 王国华 +3 位作者 赵俊学 郭子亮 汤宏亮 范皓月 《过程工程学报》 CAS CSCD 北大核心 2018年第2期393-398,共6页
为揭示高铅渣的高温挥发行为,以PbO-FeOx-CaO-SiO2-ZnO为基本渣系,借助热重分析技术,建立了质量比FeO/SiO2=1.8和CaO/SiO2=0.6、不同PbO含量的高铅渣高温挥发本征动力学模型,探讨了不同PbO含量下随温度变化熔渣的挥发特性,结合挥发后熔... 为揭示高铅渣的高温挥发行为,以PbO-FeOx-CaO-SiO2-ZnO为基本渣系,借助热重分析技术,建立了质量比FeO/SiO2=1.8和CaO/SiO2=0.6、不同PbO含量的高铅渣高温挥发本征动力学模型,探讨了不同PbO含量下随温度变化熔渣的挥发特性,结合挥发后熔渣物相和元素分析,揭示了高铅渣的挥发规律.结果表明,温度高于700℃时,高铅渣中PbO挥发最剧烈,造成渣成分波动导致测定结果偏差;含铅量为20wt%、温度700-1450℃的平均挥发率为18.58%;高铅渣高温挥发受三维扩散控制,影响因素为PbO和硅氧复合离子的含量. 展开更多
关键词 铅渣 热重分析 动力学 表观活化能 物相
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Estimating leaf mercury content in Phragmites australis based on leaf hyperspectral reflectance 被引量:3
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作者 Weiwei Liu Mengjie Li +9 位作者 Manyin Zhang DaanWang ziliang guo Songyuan Long Si Yang Henian Wang Wei Li Yukun Hu Yuanyun Wei Hongye Xiao 《Ecosystem Health and Sustainability》 SCIE 2020年第1期240-250,239,共12页
Introduction:Highmercury(Hg)concentrations affect the chlorophyll in leaves,therebymodifying leaf spectra.Hyperspectra is a promising technique for the rapid,nondestructive evaluation of leaf Hg content.In this study,... Introduction:Highmercury(Hg)concentrations affect the chlorophyll in leaves,therebymodifying leaf spectra.Hyperspectra is a promising technique for the rapid,nondestructive evaluation of leaf Hg content.In this study,we investigated Hg contents and reflective hyperspectra of reed leaves(Phragmites communis)in a gold mining(Jilin province,China).Spectral parameters sensitive to Hg content were identified through basic spectral transformations,continuous wavelet transformation(CWT),and spectral indices techniques.Leaf Hg inversion models were developed using stepwise multiple linear regression,partial least squares regression,and random forest algorithms.Outcomes:The results indicated that:1)leaf Hg content decreased with increasing distance from the mine:Jiapigou(JPG)>Erdaocha(EDC)>Laojingchang(LJC)>Erdaogou(EDG)>Lingqian(LQ)>Weishahe(WSH).2)Hg–sensitive wavelengths were primarily in the visible region;CWT increased the correlation between hyperspectral data and leaf Hg content,and improved the regression and accuracy of inversion;3)the continuumremoval–CWT–stepwise multiple linear regression was better for estimating low leaf Hg content;while the differential spectral index–partial least squares regression was better for estimating high leaf Hg content.Conclusion:These hyperspectral inversion methods could be used for rapid,nondestructive monitoring of wetland plants. 展开更多
关键词 Mercury pollution reed leaf hyperspectrum inversion model nondestructive monitoring
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