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(单位:万吨)世界总计美国日本}法国!西德{英国{意大利巴西…“兰座到塑37.620。1295.00﹃b,J .1八U ..孟J吸IJ60 .037 .8 7056.336.3 7 .08。06 .52_51 .553.口36.3 4 .5 3 .0 5_07。57 .05‘55 .09 .03 .53_72 .55 .1D .73 .0】2.5川川川川川川川引00冉“11知一03‘.二,J.勺l几....,.,...........F...eeleell........l,!......‘l nU 68,产户勺n︸.合O口0.几乙‘,月︸八j IJO﹄,J J.几5凡乙IJ灯13 5 6 65总计丁苯顺丁异戊乙丙丁羞抓丁丁脯1,288.0 736.1315.3186.6 42 .7 6 .0 23.924.0 21.3 10.8151.84.25. ,. 6. 6. 8. 9_①为估计…     

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1995年1(创刊号)一z期,1996年1一4期页10期1年95泌1 60了‘11‘.1‘11一、︶︸、︸O产9有1 nU42,‘2︸‘U︸6︸hgC,9﹃勺州3一I以6 20O了Q了O户O了n,‘曰n曰04︸勺O西6 94月片0八j4八j内、︺今︸2勺︸,︸八汽︺2内」2 2 ..1 11 2 22八j八j‘U‘UO户n,O八22一‘︶﹃勺气︺气口︸、︸/n‘U‘U‘U︸6‘U‘U 66OZQ了n,︸9八,︸Q了q︸QQ︸n萝020了Q了 题目碘甲烷对煤中有机硫的脱除作用煤的超临界醇萃取脱硫煤细磨过程中化学分散剂作用的研究黄铁矿的电化学性质及可浮性调控一种干法深度筛分的有效设备—2zKQ1230型置线振动琴弦筛细…     

佛山市顺德新城区降水中污染物的监测和分析

为掌握佛山市顺德新城区降水中污染物的情况,2015年7月至8月,文章作者分别在雨天进行了降水取样,对降水中的pH、电导率、常见阴离子(F-、Cl~-、NO_3~(2-)、SO_4~(2-))及部分重金属(铅和镉)进行监测分析。选择有相关数据的珠江三角洲和石家庄、厦门等地的降水中污染物的情况进行对比。结果表明,顺德新城区降水中的p H和部分阴离子浓度优于珠江三角洲平均值,酸雨类型属于硫酸和硝酸混合型;其水体洁净程度略差于石家庄;铅和镉的浓度也高于厦门,甚至部分超出了人体能直接接触的安全范围。     

Metabolism of trideuterated iso-lignoceric acid in rats in Vivo and in human fibroblasts in culture

Saturated very long chain fatty acids (fatty acids with greater than 22 carbon atoms; VLCFA) accumulate in peroxisomal disorders, but there is little information on their turnover in patients. To determine the suitability of using stable isotope-labeled VLCFA in patients with these disorders, the metabolism of 22-methyl[23,23,23-²H₃]tricosanoic (iso-lignoceric) acid was studied in rats in vivo and in human skin fibroblasts in culture. The deuterated iso-VLCFA was degraded to the corresponding 16- and 18-carbon iso-fatty acids by rats in vivo and by normal human skin fibroblasts in culture, but there was little or no degradation in peroxisome-deficient (Zellweger’s syndrome) fibroblasts, indicating that its oxidation was peroxisomal. Neither the 14-, 20-, and 22-carbon iso-fatty acids nor the corresponding odd-chain metabolites could be detected. In the rat, the organ containing most of the iso-lignoceric acid, and its breakdown products, was the liver, whereas negligible amounts were detected in the brain, suggesting that little of the fatty acid crossed the blood-brain barrier. Our data indicate that VLCFA labeled with deuterium at the ω-position of the carbon chain are suitable derivatives for the in vivo investigation of patients with defects in peroxisomal β-oxidation because they are metabolized by the same pathways as the corresponding n-VLCFA. Moreover, as iso-VLCFA and their β-oxidation products are readily separated from the corresponding n-fatty acids by normal chromatographic procedures, the turnover of VLCFA can be more precisely measured. A preliminary report of part of this work (Reference 18) was presented at the 5th International Symposium on the Synthesis and Applications of Isotopes and Isotopically Labelled Compounds, Strasbourg, France, June 20–24, 1994.     

高效液相色谱法分析化妆品中微量成分的研究进展

综述了高效液相色谱法在化妆品中防腐剂、防晒剂中紫外线吸收剂以及性激素的检测等几个方面的应用;同时,介绍了分析所用的色谱柱、流动相、使用的检测手段以及样品的提取方法;最后针对目前存在的问题,提出了高效液相色谱用于化妆品中微量成分分析的研究方向和发展前景。     

Denitrification in shallow groundwater in a coastal agricultural area in Japan

In a coastal agricultural area in the central part of Japan (Shizuoka), we found decreasing nitrate concentration with depth in a shallow groundwater, where the depth to water table varied between 0.6 and 1.2 m below ground surface. High nitrate concentrations (5–29 mg N L^–1) were often observed in the upper layer (0–2 m) of the groundwater, but the concentration decreased to less than 1 mg N L^–1 in the deeper layer. Ammonium was scarcely detected, and the concentration of dissolved oxygen was usually low (< 1 mgO₂ L^–1) in the groundwater. Nitrate in the groundwater often had very heavy nitrogen stable isotope ratios (>20{}). There was a negative relationship between nitrogen stable isotope ratio of nitrate and its concentration. When nitrate was injected into the groundwater with acetylene and bromide (a conservative tracer), nitrate concentration decreased to 20% of the initial level within 5 days, accompanied by the increase in nitrite and nitrous oxide concentration and a little change in bromide concentration. These results indicate that microbial denitrification plays a potential role in the decrease of nitrate in shallow groundwater at the study site.     

我国硝酸工业生产技术新进展

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