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原子吸收光谱法测定空气污染源中镉和镍 总被引:2,自引:0,他引:2
试验了用王水消解、火焰原子吸收光度法测定空气污染固定源中镉、镍;石墨炉原子吸收光度法测定散源中镉、镍。检测限分别为90×10-4mg/Nm3,0018mg/Nm3(采样体积1000L);95×10-7mg/Nm3,15×10-4mg/Nm3(采样体积10m3)。 相似文献
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本文用苦味酸溴代十六烷基吡啶离子对作为电活性物质,以邻苯二甲酸二辛酯为增塑剂,研制成以PVC为基质膜的苦味酸离子选择电极。苦味酸离子浓度在40×10-6~10×10-1M范围内,电极电位服从于Nernst方程,线性响应级差为-580mV/P苦味酸,在pH=30~105时电极不受pH影响,苦味酸离子浓度≥40×10-6M时电极电位的标准偏差小于099mV。测定了电极对硝酸根等干扰离子的选择性系数,仅2,6二硝基酚、2,4二硝基酚和钼酸根的选择性系数大于10×10-2。 相似文献
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方忻兰 《环境监测管理与技术》1995,(6)
研究了镉(Ⅱ)与4-(2-喹啉偶氮)-1,3-二羟萘(2-QADVM)的显色反应。结果表明:在0.3mnol/L氢氧化钠溶液中,当有十二烷基(2-羟乙基)二甲基氯化铵(DEMAC)存在时,镉(Ⅱ)与2-喹啉偶氮形成1:2橙红色络合物,λ_max为510_nm,摩尔吸光系数ε=1.2×105L·mol-1·cm-1,镉的浓度的在0~20μg/(25mL)范围内符合比尔定律,用2-喹啉偶氮作显色剂,可直接测定废水中的镉。试样用标准加入法测得回收率为96%~104%,相对标准偏差小于3%,用此法与双硫腙分光光度法对模拟镀镉废水进行了对比试验,其相对误差小于4%。 相似文献
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本文研究了硝酸高氯酸体系消解火焰原子吸收法测定烟尘颗粒物中镉的方法。方法的检测限为3×10-6mg/m3(采样体积10m3)。实际样品测定的相对偏差小于10%,加标回收率大于88% 相似文献
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把荧光素固定在经处理的生物膜上,研制成光导纤维生物膜碘荧光传感器。I-的线性响应范围为3×10-5mol/L—5×10-3mol/L,相对标准偏差为065%,响应时间为25~35min。 相似文献
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利用NO2—对对硝基苯胺的褪色作用光度法测定污水中NO2— 总被引:1,自引:0,他引:1
在006 m ol/ L 的盐酸介质中, N O2- 与对硝基苯胺(10×10- 4 m ol/ L)反应生成无色的重氮盐使对硝基苯胺溶液褪色,于382 nm 处测量吸光度的变化。 N O2- 在006~40 m g/ L 内服从比耳定律,回收率为95% ~104% 。本法选择性好,操作简便,适用于污水中 N O2- 的测定。 相似文献
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针对目前室内环境监测工作出现的种种问题,就如何规范的开展室内环境监测工作,更好地为社会提供真实、准确、有效的监测数据,本文提出相关的探讨。 相似文献
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Peter Timmerman 《Environmental monitoring and assessment》1998,49(2-3):111-122
The social and economic implications of atmospheric change on biodiversity need to be seen in a global context of major shifts in the conceptualization and management of our relationship with nature. Traditionally, we have conceptualized the atmosphere and the other creatures of the biosphere as separate from the human, but their quasi-autonomy is now becoming subject to more and more human management. This raises not only economic issues, but social, political, and ethical concerns that will have substantial influence on public policy. Among these are the commodification of genetic material; the privatization of traditional knowledge; and the management of information. In this broader context, the paper examines an array of current and proposed strategies of response to changes in biodiversity as a result of climatic and other stresses. 相似文献
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Canada responded to the Global Biodiversity Convention by completing the Canadian Biodiversity Strategy in 1995. At the same time, Environment Canada also completed a national Science Assessment on Biodiversity. During this period, the Smithsonian Institution, in partnership with Parks and Environment Canada, initiated the implementation of a global biodiversity monitoring program in Canada. Under the auspices of the United Nations Man and the Biosphere Program, the SI/MAB monitoring protocols and plots have spread across Canada at an unprecedented rate. National champions in the science and educational sectors, working within an inter-disciplinary ecological framework, have guided the development, education, quality control and sharing of atmosphere-biodiversity observations electronically.Atmospheric-Biodiversity Networks and Networking have traditionally operated within separate mandates with little degree of integration. Air-Bio Networks were designed within an integrated framework to better understand the atmospheric stress on biodiversity and the adaptation actions, nationally and regionally. Detailed examples of the cumulative effects of climate change, stratospheric ozone depletion, acid deposition, ground-level ozone, suspended particulate matter and hazardous air pollutants on biodiversity will be discussed using a Southern Ontario case study. In addition, recommendations will be presented for future paired SI/MAB plots, linked networks and networking for adaptation within the context of climate, chemical and ecological gradients. 相似文献
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Xiangyun Liu Yan Yang Ying Cui Huijun Zhu Xiong Li Zhining Li Kankan Zhang Deyu Hu 《Environmental monitoring and assessment》2014,186(8):5307-5313
A simple and accurate method of determining metalaxyl and cymoxanil in pepper and soil was developed by ultra-performance liquid chromatography–photodiode array detection. The limits of detection were 0.015 mg/kg for metalaxyl and 0.003 mg/kg for cymoxanil. The limits of quantification were 0.05 mg/kg for metalaxyl in pepper and soil as well as 0.01 mg/kg for cymoxanil in pepper and soil. Recoveries of pepper and soil were investigated at three spiking levels and ranged within 77.52 to 102.05 % for metalaxyl and 87.15 to 103.21 % for cymoxanil, with relative standard deviations below 9.30 %. For field experiments, the half-lives of metalaxyl were 3.2 to 3.9 days in pepper and 4.4 to 9.5 days in soil at the three experimental locations in China. At harvest, pepper samples were found to contain metalaxyl and cymoxanil well below the maximum residue limit MRLs of the European Union (EU) following the recommended dosage and the interval of 21 days after last application. 相似文献
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Junxue Wu Hongyan Zhang Kai Wang Chengju Wang 《Environmental monitoring and assessment》2014,186(2):1195-1202
A simple and accurate method for the determination of bismerthiazol and its metabolite 2-amino-5-mercapto-1,3,4-thiadiazole was developed in Chinese cabbage and soil by high-performance liquid chromatography-diode array detection in this study. The limits of detection were 0.06 mg/kg for bismerthiazol and 0.03 mg/kg for 2-amino-5-mercapto-1,3,4-thiadiazole, respectively. Recoveries of cabbage and soil were investigated at three spiking levels and were in the range of 84.0–96.0 % for bismerthiazol and 71.0–74.6 % for 2-amino-5-mercapto-1,3,4-thiadiazole, with relative standard deviations below 7.0 %. For field experiments, the half-life of bismerthiazol was 2.4–2.5 days in Chinese cabbage and 2.5–4.8 days in soil at the two experimental locations in China. Dissipation residues of 2-amino-5-mercapto-1,3,4-thiadiazole were lower than 0.72 mg/kg. Terminal residues of bismerthiazol and its metabolite were less than 3.0 and 0.3 mg/kg in Chinese cabbage, respectively. No bismerthiazol or metabolite residues were detected in soil on days 5, 7, 10, and 14 after the last spraying at the two dosage levels. 相似文献
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Lin Wang Wenming Li Puyu Li Minghui Li Shuo Chen Lijun Han 《Environmental monitoring and assessment》2014,186(11):7793-7799
A simple residue analytical method using the quick, easy, cheap, effective, rugged, and safe (QuEChERS) procedure for the determination of trifloxystrobin and its metabolite trifloxystrobin acid (CGA321113) in tomato and soil was developed using high-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS). The limits of detection were 0.0005 mg/kg for trifloxystrobin and 0.001 mg/kg for trifloxystrobin acid, respectively. The average recoveries in tomato and soil ranged from 73–99 % for trifloxystrobin and 75–109 % for trifloxystrobin acid, with relative standard deviations below 15 %. The method was then used to study the dissipation and residues in tomato and soil. The dissipation half-lives of trifloxystrobin in tomato were 2.9 days (Beijing) and 5.4 days (Shandong), while in soil were 1.9 days (Beijing) and 3.0 days (Shandong), respectively. The final results showed that the major residue compound was trifloxystrobin in tomato whereas it was its metabolite, trifloxystrobin acid, in soil. The final residues of total trifloxystrobin (including trifloxystrobin acid) were below the EU maximum residue limit of 0.5 mg kg?1 in tomato 3 days after the treatment. 相似文献
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