Determination of Acaricide Residues in Saudi Arabian Honey and Beeswax Using Solid Phase Extraction and Gas Chromatography

Determination of acaricide residues of flumethrin, tau-fluvalinate, coumaphos, and amitraz in honey and beeswax was carried out using a rapid extraction method utilizing C-18 SPE cartridges and an analytical method utilizing GC with ECD, NPD, and MSD detectors for the four acaricides. Recovery percentages from the extraction method ranged from 90–102%, while the minimum detection levels ranged from 0.01–0.05 mg/kg for the acaricides. Nine of the 21 analyzed samples were found to be contaminated with the acaricides tau-fluvalinate and coumaphos. Neither flumethrin nor amitraz was detected in any of the honey or wax samples. Coumaphos was found only in honey samples in which two samples exceeded the tolerance levels set by EPA and EC regulations. It has not been detected in beeswax. Five honey samples and eight beeswax samples were found to be contaminated with tau-fluvalinate. One of the wax samples was contaminated with a relatively high residue of tau-fluvalinate and contained above 10 mg/kg.     

环境样品阿特拉津及降解产物分析方法进展

阿特拉津是一种世界范围广泛使用的除草剂。文章介绍了环境样品中阿特拉津及其降解产物分析的前处理技术和分析方法的研究进展,并为今后的研究方向提出了建议。     

固相微萃取-毛细管气相色谱法快速同步分析水中硝基苯类及氯苯类化合物

固相微萃取是一种快速、简便、集萃取浓缩进样于一体的样品前处理技术,具有分析时间短、灵敏度高、无需有机溶剂的优点。文章用固相微萃取富集水中9种硝基苯类及5种氯苯类化合物,毛细管气相色谱ECD检测器分离分析,整个分析过程只需25min,检出限可达0.0002~0.02μg/L,已用于地表水、海水与工厂废水中硝基苯类及氯苯类化合物含量的测定。     

便携式气相色谱法测定室内空气中的苯系物

介绍了FFKM301便携式气相色谱仪在室内空气苯系物现场监测中的应用,通过对便携式气相色谱仪柱温、压力、泵抽时间和反吹时间等条件的讨论,确定了最佳的方法设置:柱温60℃、压力12psi、泵抽时间20s、反吹时间300s,该方法的检出限为10ppb(苯),精密度小于6%,与经典的气相色谱法进行对比试验,相对偏差不超过20%,能够满足室内空气苯系物的监测要求。     

GC-MS测定土壤中酞酸酯类化合物

采用毛细管柱气相色谱-质谱联用选择离子检测(GC-MS-SIM)技术,结合快速萃取和佛罗里硅土柱净化方法分析土壤中的六种酞酸酯类(PAEs)化合物。结果表明,六种PAEs峰形好,平均加标回收率为76.7%~110%,相对标准偏差为2.5%~4.5%。方法具有操作简便、回收率高、纯化效果好和对环境友好的特点,且具有很强的实用性。     

Tissue distribution of polychlorinated naphthalenes (PCNs) and non-ortho chlorinated biphenyls (non-ortho CBs) in harbour porpoises (Phocoena phocoena) from Swedish waters

Polychlorinated naphthalenes (PCNs) and non-ortho chlorinated biphenyls (non-ortho CBs) were analysed in blubber, nuchal fat, liver, muscle, kidney and brain of three male harbour porpoises (Phocoena phocoena) from the west coast of Sweden. To estimate spatial variation, PCNs and non-ortho CBs were analysed in six blubber samples collected at different anatomical sites of each animal. Highest wet weight concentrations of ΣPCNs were detected in the lipid rich tissues (blubber and nuchal fat) and liver (520–730 and 520 pg/g, respectively) and lowest in brain (22 pg/g). TetraCNs were most abundant in muscle, kidney and brain, while the hexaCNs were most abundant in the lipid rich tissues and liver. The highest lipid weight concentration recorded (11 ng/g) was for the hexaCN congeners no. 66/67 in liver. These coeluting hexaCN congeners accounted for 80–100% of total hexaCNs in all tissues examined.

Concentrations of Σnon-ortho CBs were highest in lipid rich tissues (220–280 pg/g wet weight). Non-ortho CB no. 77 and 169 constituted between 62–86% and 4.9–9.3%, respectively, of total Σnon-ortho CBs. No major variation of Σnon-ortho CB concentrations was found between the six different blubber sites but higher ΣPCN concentrations (wet weight) were found dorsally at the peduncle. Toxic equivalent concentrations (TEQs) showed that non-ortho CB no. 126 was the main contributor to total TEQs in all tissues, except liver in which hexaCN congener nos. 66/67 contributed to about 50% of total TEQs.     

水解酸化-缺氧法处理采油废水的污染物迁移降解试验研究

水解酸化-缺氧法对采油废水有较好的处理效果,采用GC/MS技术对水解酸化-缺氧法处理采油废水过程中污染物的迁移降解进行的研究表明:水解酸化段和缺氧段对采油废水中碳原子为C6～C9、分子量为100～140的有机物均有较好的降解能力.其中,在水解酸化段中酮类、芳烃得到较好的降解,缺氧段中酚类和醚类化合物降解明显.水解酸化-缺氧工艺对于采油废水中的甲苯和二甲苯具有较好的降解能力.     

城市垃圾焚烧炉飞灰中多环芳烃分析研究

报道了气相色谱/质谱分析垃圾焚烧厂飞灰样品中多环芳烃的分析方法和分析结果,建立了气相色谱/质谱分析垃圾焚烧厂飞灰样品中多环芳烃的分析方法。方法的加标回收率基本在80%～110%之间。     

一次地下水污染事件的调查

对污染源及受污染地下水的调查首先从污染物的产生特性及嗅味入手，在对被污染地下水周边企业调查的基础上，运用GC/MS联用仪对受污染的地下水进行分析，鉴定出污染物为四氢噻吩，利用气相色谱半定量分析出污染源及地下水中污染物的浓度，最后确定出地下水受污染的原因以及其污染范围。     

农田土壤中辛基酚聚氧乙烯醚降解菌的分离

研究针对采自上海孙桥农业园区8个不同来源的农田表层土壤样品(旱田、水田、大棚中的不同作物土壤),以辛基酚聚氧乙烯醚(OPEOn)为唯一碳源培养,在好氧条件下,观察其生物降解情况,并初步分离得到了六株OPEOn降解菌株(1个真菌,5个细菌),它们能够不同程度地降解OPEOn,利用气相色谱仪(GC)对降解产物进行了表征和鉴别,分别从3个土壤样品中分离得到的菌株对OPEOn降解得最为彻底,为后续研究工作的深入奠定了生物学基础。