室温平衡顶空气相色谱法测定水中挥发性卤代烃影响因素的研究

对室温下用顶空气相色谱法测定水听军发性卤代烃的影响因素进行了研究，结果表明，随着样品浓度的增高，平衡时间缩短；气液平衡瓶体积增大，平衡时间加长；同一瓶样品重复进样次数不得多于2次；适宜的气液体积比为1：2。室温平衡顶空气相色谱法简单易行。     

气相色谱法测定水质苯系物

指出了气相色谱法测定水质苯系物存在的不足，提出用3％有机皂土－34＋2．5％邻苯二甲酸二壬酯混合涂渍的101坦体（60目－80目）不锈钢色谱柱分离苯系物，可在19min内分离水样中7种苯系物，对二甲苯与间二甲苯等难分离物质对可完全分离，改进后的样品前处理顶空装置操作简单、安全、可连续自动振荡，并且可以同时处理多个样品。     

Quantification of Polycyclic Aromatic Hydrocarbons in Tea and Coffee Samples of Mumbai City (India) by High Performance Liquid Chromatography

This paper describes a method for quantification of sixteen polycyclic aromatic hydrocarbons (PAHs) in tea and coffee samples of Mumbai City with the help of reversed phase high performance liquid chromatography with UV-VIS detector. This method is based on liquid–liquid extraction followed by clean up with C-18 cartridge. Concentration of total PAHs in different brands of tea and coffee samples varied from 18.79 to 31.37 μg/L and from 16.47 to 18.24 μg/L, respectively. Mean concentration of total PAHs was 27.56 μg/L in tea and 17.20 μg/L in coffee. Recoveries at different concentration levels were higher than 68% in samples of tea and coffee. Detection limit was found to be low (0.0006 ng) for anthracene and highest (0.174 ng) for naphthalene with relative standard deviation between 0.4%–7%.     

Persistence and Dissipation of Readymix Formulations of Insecticides In/On Okra Fruits

Dissipation behaviour of ready mix polytrin C 44EC (profenophos 40% + cypermethrin 4%) and spark 36EC (triazophos 35%+.deltamethrin 1%) applied at 1 L/ha in okra crop during Kharif in year 2000 was studied at 0, 1, 3, 5 and 7 days after treatment. Dissipation on 7th day was found to be maximum (98.4%) for profenophos followed by triazophos (86.2%), cypermethrin (73.5%) and deltamethrin (55.7%). Half life (t1/2) values for the above insecticides were 1.35, 2.55, 4.11 and 7.60 days, respectively. All the insecticides followed a first order kinetics. Profenophos and triazophos followed a biphasic dissipation pattern with faster dissipation in phase I (0–1 days) and manifesting slower rate of dissipation in phase II (1–7 days).     

气相色谱直接进样法测定水中的N-甲基哌嗪-应急监测分析方法

建立了水中N-甲基哌嗪的应急监测分析方法,在3分钟内完成整个分析过程。采用直接进水样的方法,经毛细管柱分离水中的N-甲基哌嗪,用GC/FID测定,以保留时间定性,峰高定量。在浓度范围为8.44～80.32mg/L时,相对标准偏差在1.8％～2.9％之间,标准偏差在0.19～1.5之间。样品的加标回收率可达81％,标准曲线的相关系数为0.9992。检出限为0.08mg/L     

正己烷萃取-气相色谱法快速测定水中三氯乙烯

采用正己烷萃取法对水中三氯乙烯进行富集,用毛细管柱气相色谱法进行测定;通过正交试验,对气相色谱测定的主要影响因素和条件进行优化选择,并进行定量评价,总结其影响规律,最终确定最佳测定条件。同时对该方法检出限、准确度和精密度进行检验,完成方法验证。结果表明,该方法简单、快速、准确可靠,灵敏度高,在水环境质量监测中具有实用性。     

丁苯橡胶生产废水的生物降解特性

为研究丁苯橡胶生产废水的好氧生物降解特性,对某石化企业丁苯橡胶生产装置的生产废水进行好氧处理,并采用液液萃取-气相色谱/质谱、三维荧光光谱、紫外吸收光谱等手段对水质指标进行表征. 结果表明:经好氧生物降解后,丁苯橡胶废水中ρ(COD_Cr)和ρ(DOC)分别降至155和76 mg/L,COD_Cr和DOC去除率分别为76.07%和70.08%;废水中二苄胺、苯乙烯和十二烷基二甲基叔胺等9种主要特征有机物19 d内可被完全降解. 丁苯橡胶生产废水在λ_Ex/λ_Em(激发波长/发射波长)为225 nm/340 nm、215 nm/290 nm,275 nm/340 nm处有3个荧光峰,分别由二苄胺、十二烷基二甲基叔胺、苯乙烯、甲苯和苯甲醛等胺类、苯乙烯和芳香族化合物等有机物产生,好氧生物降解能去除废水中的绝大部分荧光物质,荧光峰强度的总去除率达到93.87%;废水中二苄胺、十二烷基二甲基叔胺、4-甲基环己酮、苯甲醛,苯乙烯、甲苯等有机物使丁苯橡胶生产废水分别在波长190~230、230~250、250~400 nm处有紫外吸收,好氧生物降解对UV₂₅₄的去除率达到52%. 研究显示,丁苯橡胶废水经单独好氧生物处理不能达到GB 31572—2015《合成树脂工业污染物排放标准》的要求,需结合其他方式进行联合处理.      

A new technique helps to uncover unknown peptides and disinfection by-products in water

正Environmental water samples can be extremely complex,with potentially thousands of molecules that can derive from natural organic matter(NOM)and thousands that derive from anthropogenic contaminants.As complex as these samples are,drinking water can be even more complex.Due to disinfectants that are used to treat drinking water(e.g.,chlorine,chloramines,     

气相色谱法测定水中七种有机磷农药研究

水中微量有机磷农药经二氯甲烷萃取、净化、凝胶净化色谱(GPC)浓缩,用带火焰光度检测器(FPD)的毛细管柱气相色谱仪测定.实验结果表明:七种有机磷农药曲线线性良好,相关系数可达0.999以上;检出限能够满足《地表水环境质量标准》限值要求;加标回收率范围为81.4%~92.4%,相对标准偏差范围为2.5%~7.3%,相对误差范围为1.9%~8.5%.可以同时测定《地表水环境质量标准》中规定的7种有机磷农药,提高工作效率.     

吹扫捕集-气相色谱-质谱联用法测定地表水中1,2-二氯苯和1,4-二氯苯研究

通过吹扫捕集富集地表水中1,2-二氯苯和1,4-二氯苯,解吸后用气相色谱-质谱联用法同时测定,内标法定量,加入硫酸钠提高方法的灵敏度,优化并验证检测方法.1,2-二氯苯和1,4-二氯苯在一定浓度范围内线性关系良好,方法检出限为0.01 μg/L,加标回收率和测定结果的相对标准偏差较好,符合分析测试质量控制要求.具有操作简单、样品用量少、组分损失低、回收率高等优点,不对环境造成二次污染.