大气中挥发性苯系物的Carbotrap吸附气相色谱法

本文研究以Ｃａｒｂｏｔｒａｐ作吸附剂，在常温采集大气中挥发性苯系物，直接采用热脱附气相色谱分析。对新型吸附剂Ｃａｒｂｏｔｒａｐ的采样－脱附－分析精度，回收率，突破体积等作了试验。本法具有灵敏度高，操作简单，不需复杂的样品预处理，色谱峰好，吸附剂可反复使用等优点。可对大气中１０－９级苯系物进行测定，ＲＳＤ≤３．５％。     

大气中苯乙烯的气相色谱法测定

采用活性炭管吸附大气中基苯乙烯，以二硫化碳洗脱，以溴水加成后，用气相色谱电子捕获器测定苯乙烯的二溴加成物。本方法适合于检测多种污染物共存的大气中痕量苯乙烯。其线性范围为０．０１５－０．７４ｎｇ，最低检出浓度为０．００１ｍｇ／ｍ＾３；重现性实验的变异系数为２．３％：当活性炭管吸附苯乙烯在２．９μｇ时，回收率为９０％，吸附苯乙烯０．２９μｇ时，回收率为７２％。     

沸石在水污染控制中的研究与应用进展

综述了沸石在水污染控制领域的理论研究和应用的进展。     

天然矿石毒重石吸附硫酸盐废水的试验研究

利用天然矿石毒重石对硫酸盐废水进行吸附处理，在废水的pH=9，停留时间为80min左右时，该吸附剂具有较好的吸附效果。且该离子交换吸附法具有成本低、操作简单、无二次污染的优点。     

铜离子冲击下活性污泥微生物多样性的分子生态学分析

采用基于 16SrDNA序列分析方法 ,在长度多态 (LPM)和 16SrDNA的GC含量二维水平分析了受重金属污染的活性污泥系统内细菌的优势种类和多样性 .设计的PCR引物可以将细菌分为三大类 :即 1)proteobacterialα&δ(变形杆菌α&δ) ,2 )pro teobacterialβ&γ(变形杆菌 β&γ) ,以及 3)flexibacter(屈桡杆菌 )和革兰氏阳性菌 .分析了未受重金属驯化和受重金属驯化的两类活性污泥系统在重金属作用下优势种和多样性的变化 ,结果显示未驯化的活性污泥系统多样性减少但优势种的变化微小 ,而驯化系统优势种有较大的变化 ,但多样性基本不变 .这一结果证实驯化有助于提高微生物对重金属的抗性     

用植物清除土壤中的重金属

介绍了生物修复技术去除土壤中的重金属及对植物的要求.植物能去除土壤中的有毒金属,将金属富集在生物体内,或将金属变成挥发性气体.     

饮用水中五种有机磷农药的快速检测法

本文介绍了使用Ｗａｔｅｒｓ ＯＡＳＩＳ－ＨＬＢ固相萃取小柱从水中分离富集敌百虫、敌敌畏、乐果、甲基对硫磷，对硫磷五种有机磷农药的快速检测法。     

含硫化合物的气相色谱检测响应特性研究

利用气相色谱（配炎焰光度检测器）对二硫化碳（ＣＳ２）、甲硫醇（ＣＨ３ＣＨ）、甲硫醚（ＤＭＳ）和二甲二硫醚（ＤＭＤＳ）４种含硫物质进行了分析检测，着重讨论了气相色谱仪的各项参数对几种含硫物质响应和分离效果的影响。结果表明：该分析对含硫气体的最小检测浓度达到ｐｐｂ级。在各项参数中，色谱柱温度在Ｎ２压力对各含硫物质响应和分离度影响最大，汽化室和检测器温度及空气压力对它们的影响相对较小。     

Immediate prenatal diagnosis of Zellweger syndrome by direct measurement of very long chain fatty acids in chorionic villus cells

We report a gas chromatographic-mass spectrometric method which allows the very long chain fatty acids content of trophoblastic tissue to be directly measured in samples collected by biopsy between 8 and 11 weeks of gestation. This method has been successfully applied to the detection of fetal Zellweger syndrome in two pregnant women who had previously delivered affected infants. In one of them, increased concentrations of C26:0 (0.254 versus 0.108±0.035 μ/mg proteins) and C24:0 (1.32 versus 0.815±0.325 μ/mg proteins) in trophoblast indicated that the fetus had Zellweger syndrome, a diagnosis confirmed by pathological findings after abortion. In the second case, the pregnancy was allowed to proceed, on the basis of normal concentrations of very long chain fatty acids in trophoblastic tissue, and its outcome was actually a healthy newborn.     

Direct hydride derivatization of methyl- and ethylmercury chlorides in aqueous solution with KBH4

A convenient hydride derivatization procedure of methyl-and ethylmercury chlorides to volatile hydrides was reported. In sealed vials methylmercury and ethylmercury compounds in acidic aqueous solutions were converted into their volatile forms by the reaction with potassium tetrahydroborate(KBH4) and elvolved to the headspace of the vials. The gaseous analytes in the headspace were extracted and concentrated by solid phase microextraction(SPME) and injected into gas chromatography (GC) for separation and identified by mass selective detector(MS).