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铅的挥发性
相关语句
  volatility of lead
     Research on the Volatility of Lead During Sub-critical Water Treatment of Coal
     亚临界水条件下煤中铅的挥发性研究
短句来源
     At same temperature the volatility of lead from coal by sub-critical extraction is higher than that by pyrolysis.
     在相同温度下,亚临界水处理过程中铅的挥发性要高于热解过程中铅的;
短句来源
  相似匹配句对
     Research on the Volatility of Lead During Sub-critical Water Treatment of Coal
     亚临界水条件下煤中铅的挥发性研究
短句来源
     Mouse Embryotoxicity of Lead in Vitro
     铅的体外胚胎毒性
短句来源
     Analytical Methods of Trace Lead
     铅的痕量分析技术
短句来源
     THE VOLATILE CONSTITUENTS OF HEMEROCALLIS CITRINA
     黄花菜的挥发性成分
短句来源
     the water volatility of the resin was small;
     水分挥发性小;
短句来源
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Objective〕 To determine the extent of the harm of lead and cadmium in Cigarette for the active and passive smokers through study on th eir volatility in the course of smoking. 〔Methods〕 Samples were digested in a mixed acid of HNO_3 and HCIO_4 and the background leve l of le ad and cadmium in cigarette and their total residual level of cigarette smoked i n filter tip, cigarette butt and cigarette ask determined by Differential Poteti on metric Stripped Analysis (DPSA) and the volatile quantity calculated....

Objective〕 To determine the extent of the harm of lead and cadmium in Cigarette for the active and passive smokers through study on th eir volatility in the course of smoking. 〔Methods〕 Samples were digested in a mixed acid of HNO_3 and HCIO_4 and the background leve l of le ad and cadmium in cigarette and their total residual level of cigarette smoked i n filter tip, cigarette butt and cigarette ask determined by Differential Poteti on metric Stripped Analysis (DPSA) and the volatile quantity calculated. 〔Results 〕 There was no significant difference between the total residual level of Pb in the cigarette and the background level (P>0.05) and there was significant difference between the total residual level of Cd and the background level (P<0 .001). 〔Conclusions〕 The volatility of lead in cigare tte is lower and lead is adsorbed through cigarette butt and filter tip in the c ourse of smoking ,so it does not harm the active and passive smokers. However, v o latile quantity of cadmium is lighter and adsorption capacity of the filter tip is lower, so it does some harm to active and passive smokers.

〔目的〕通过研究吸烟过程中香烟中铅和镉的挥发性 ,确定它们对主动吸烟者及被动吸烟者的危害程度。〔方法〕采用混酸消化样品、微分电位溶出法 (DPSA)测定香烟中铅和镉的本底值与香烟吸过后过滤咀、烟头和烟灰中铅和镉的总残留量 ,并计算挥发量。〔结果〕香烟中铅和镉的总残量与本底值t检验 :铅 ,无差异显著性P >0 .0 5;镉 ,有差异显著性P <0 .0 0 1。〔结论〕在吸烟过程中 ,香烟中铅挥发性较小 ,且通过烟头及过滤咀的吸附 ,对主动吸烟者及被动吸烟者造成危害甚微 ;镉的挥发性较大 ,且过滤咀吸附量较小 ,故对主动吸烟者及被动吸烟者均可能造成危害。

The amounts of heavy metal elements in cigarette background and their total residuals in filter tip,cigarette butt and cigarette ash were determined by atomic fluorescence spectrometry and graphite furnace atomic absorption spectrometry,and the volatile quantity was calculated in the course of smoking.The volatility of As and Pb in cigarette are low and they can be absorbed through cigarette butt and filter tip in the course of smoking,which has no harm to the active and passive smokers.However,volatile quantity...

The amounts of heavy metal elements in cigarette background and their total residuals in filter tip,cigarette butt and cigarette ash were determined by atomic fluorescence spectrometry and graphite furnace atomic absorption spectrometry,and the volatile quantity was calculated in the course of smoking.The volatility of As and Pb in cigarette are low and they can be absorbed through cigarette butt and filter tip in the course of smoking,which has no harm to the active and passive smokers.However,volatile quantity of Hg and Cd are very higher and their absorption capacity in filter tip are very lower, which may have some harm to active and passive smokers.

原子荧光光谱、石墨炉原子吸收光谱法测定了不同品牌香烟中重金属的本底值与香烟吸过后过滤嘴、烟头和烟灰中重金属的总残留量,并计算在吸烟过程中重金属的挥发量。结果表明,在吸烟过程中,香烟中砷和铅挥发性较小,且通过烟头及过滤嘴的吸附,对主动吸烟者及被动吸烟者造成危害甚微;而汞和镉的挥发性较大,且过滤嘴吸附量较小,故对主动吸烟者及被动吸烟者均可能造成危害。

Removal and volatility of lead in WJP coal and HYS coal during sub-critical water treatment in a semi-continuous reactor were studied.The effects of temperature and pressure on the volatility of lead were examined;and sequential chemical extraction and float-sink experiments also were conducted in order to determine the occurrence mode of lead in the coal samples and the residuals.The results show that during sub-critical water treatment,it is difficult for lead to release from the two Chinese coals,and with...

Removal and volatility of lead in WJP coal and HYS coal during sub-critical water treatment in a semi-continuous reactor were studied.The effects of temperature and pressure on the volatility of lead were examined;and sequential chemical extraction and float-sink experiments also were conducted in order to determine the occurrence mode of lead in the coal samples and the residuals.The results show that during sub-critical water treatment,it is difficult for lead to release from the two Chinese coals,and with increasing of temperature,the removal and volatility in the two coals are also increasing.At 320℃ the removal of lead from WJP and HYS coal is 4.9% and 7.1%;and when the temperature increases to 380℃,it is 24.6% and 10.9%,respectively.When the temperature is 410℃,the removal of lead from HYS coal increases to 13.7%.At same temperature the volatility of lead from coal by sub-critical extraction is higher than that by pyrolysis.Extraction pressure just has no obvious effect on the removal and volatility of lead in the two Chinese coals.Lead in HYS and WJP coals mainly exists in the insoluble forms which content is 46% and 54%,respectively;and it is also associated with carbonates,mono-sulfide andsulfates,disulfide and some organic matters.During sub-critical water extraction,lead in these forms all decreases and turns into new stable forms.

运用半连续反应装置对山西吴家坪煤和四川华荧山煤中铅在亚临界水萃取过程中的脱除率和挥发性进行了研究.着重考察了反应温度、压力对铅脱除率和挥发性的影响;同时应用浮沉实验和逐级化学提取考察了原煤及残渣中铅的赋存形态.研究结果表明:在亚临界水条件下,2种煤中铅都不易挥发;随着温度升高,2种煤中铅的脱除率和挥发性都有所增加,当温度从320℃增加到380℃时,吴家坪和华荧山两煤中铅的脱除率分别从4.9%和7.1%增加到24.6%和10.9%;当温度升高到410℃时,华荧山煤中铅的脱除率增加为13.7%;在相同温度下,亚临界水处理过程中铅的挥发性要高于热解过程中铅的;随着压力的增大,2种煤中铅的脱除率和挥发性无明显变化;华荧山和吴家坪煤中的铅都主要以不溶态存在,分别为46%和54%,同时也以碳酸盐结合态、硫酸盐和单硫化物结合态及二硫化物和部分有机质结合态存在,亚临界水萃取过程中,2种煤中以上述形态赋存的铅都有所减少并转化为新的含铅不溶稳定态.

 
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