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On basis of theoretical analysis, a concept that the efficiency of sulfur oxide absorption depends directly on the value of the reactive surface layer is proposed Experimental data are well correlated with the theoretical analysis, and a correlation describing the absorption process is introduced. By experiments, the weight fractions of the reactive surface layer of the granular limestone with definite diameters to their total weights are determined. It is found that the reactive surface layer of all those limestone...

On basis of theoretical analysis, a concept that the efficiency of sulfur oxide absorption depends directly on the value of the reactive surface layer is proposed Experimental data are well correlated with the theoretical analysis, and a correlation describing the absorption process is introduced. By experiments, the weight fractions of the reactive surface layer of the granular limestone with definite diameters to their total weights are determined. It is found that the reactive surface layer of all those limestone granules remaining in the fluidized bed has almost the same thickness. This will enable us fo choose the optimum size of the limestone granules By Experimental method, the absorptivity of the fine limestone granules is improved, and the regeneration of the used limestone granules is also discussed.

本文提出了二氧化硫吸收效率直接地决定于沸腾层内石灰石颗粒的可反应表层的数量的概 念,试验结果与理论分析相符合,从而得到描述二氧化硫吸收效率的正确关系式。本文报导了测 定不同粒径的石灰石颗粒的可反应表层在颗粒重量中所占份额的工作,发现停留在沸腾层内的 不同粒径的石灰石颗粒具有几乎相同的可反应表层深度,从而为选择床层气速、石灰石粒径范围 提供了依据。本文还报导了提高细微颗粒石灰石利用率的试验和石灰石脱吸再生的试验结果。

A method for the determination of arsenic ( Ⅱ ) and total arsenic in sea water by anodic stripping voltammetry was investigated. By the simut-aneous deposition of gold and arsenic directly onto the glassy carbon electrode, arsenic ( Ⅱ ) was determined. The successful procedure for the determination of arsenic ( Ⅴ ) involved digesting by K2S2O3 and reducing arsenie ( Ⅴ ) to arsenic ( Ⅱ ) by Na2SO3 as reducing agent, then the total arsenic was determined, The detection limit was 3 ×10-10M. The recoveries for As(Ⅱ)and...

A method for the determination of arsenic ( Ⅱ ) and total arsenic in sea water by anodic stripping voltammetry was investigated. By the simut-aneous deposition of gold and arsenic directly onto the glassy carbon electrode, arsenic ( Ⅱ ) was determined. The successful procedure for the determination of arsenic ( Ⅴ ) involved digesting by K2S2O3 and reducing arsenie ( Ⅴ ) to arsenic ( Ⅱ ) by Na2SO3 as reducing agent, then the total arsenic was determined, The detection limit was 3 ×10-10M. The recoveries for As(Ⅱ)and As ( Ⅴ )were 106± 4 % and 101×110% respectively. The satisfactory reprcducibility was obtained only after a sample was pre -treated by heating.

本文研究了用阳极溶出伏安法测定海水中的砷(Ⅲ)和砷。用玻碳电极同位镀金直接测定砷(Ⅲ);用过硫酸钾消化后,亚硫酸钠将砷(Ⅴ)还原成砷(Ⅲ)而测得砷。本方法的检出限达3×10~(-10)M。回收率砷(Ⅲ)为106±4%,砷为101±11%。样品经过简单的预处理能得到较好的重现性。

An automatic potential method have been developed to measure totaliodine in seawater by glassy carbon electrode. It is based on nearlystraight variations in potential of working electrode in cerium (Ⅳ)-arsenic (Ⅱ) system containing iodine as a catalyst, and the potentialvaring speed is directly proportional to the iodine concentration.Experimental results show that chief interference in iodine measurementwould arise from chloricion, but not from bromicion, and therelationsof potential varing speed with iodine...

An automatic potential method have been developed to measure totaliodine in seawater by glassy carbon electrode. It is based on nearlystraight variations in potential of working electrode in cerium (Ⅳ)-arsenic (Ⅱ) system containing iodine as a catalyst, and the potentialvaring speed is directly proportional to the iodine concentration.Experimental results show that chief interference in iodine measurementwould arise from chloricion, but not from bromicion, and therelationsof potential varing speed with iodine concentration are given by followingexperimental equations:(dE/dt)_T=(30.2)=(0.0055+0.00014S) [I]+0.0025S+0.0033(dE/dt)_-(20.?)=(0.0029+0.00007S) [I]+0.00069S+0.0010 Three quantitative methods according to calibrated curve, simple st-andard addition and multiple standard additions are used for determiningiodine, among others the multiple standard additions method is most acc-urate, the accuracy and recovery for the sample containing 5.0μg of iodine/1are 0.15μg of iodine/1 and 101±5% respectively. The potential fixed m-ethod is simple, rapid and convenient in field measurement.

本文采用玻璃石墨电极自动电位测量-记录装置测定了海水中的碘量。该方法基于铈(Ⅳ)-砷(Ⅲ)体系被碘催化时的电位变化几呈线性,而且变化速度与碘浓度成正比。实验证明,海水中氯离子是主要干扰性物质,溴离子影响较小。电位变化速度可以表示为(dE/dt)_(T=30·C)=(0.0055+0.00014S)[Ⅰ]+0.0025S+0.0033 (dE/dt)_(T=20·C)=(0.0029+0.00007S)[Ⅰ]+0.00069S+0.0010 为了减少误差、简化操作,可以在每次测定时原位确定本底值,并且采用标准添加法进行定量。多次标准添加作图法可以获得比较准确可靠的数据。简单的固定电位计时法适于现场分析,并能得到满意结果。该方法检出下限为0.2微克碘/升,对于含有50微克碘/升的海水样品,经十倍冲稀后测定,准确度为0.26微克碘/升,回收率101±5%。木文所提出的电测技术具有灵敏、快速、准确、自动和简单等特点,适于微量样品分析和现场检测。在催化分析中可望得到新的实际应用。

 
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