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521.
522.
联合应用高效雾化器、缝式石英管火焰原子吸收法,采用萃取富集技术测定砷,使砷的灵敏度改善267倍,同时消除了大量盐类的干扰,避免了钠、铝等对石英管的损坏。考察了溶液酸度、碘化钾用量、共存离子等因素对实验的影响。该方法的线性范围为0~25μg/L,检出限为。3μg/L,相对标准偏差为3.2%,回收率为97.8%~101.0%,用于环境水样中痕量砷的监测,结果令人满意。 相似文献
523.
用石墨炉原子吸收分光光度法测定环境废水中的痕量镉时,Mn、Cr、Ni、Cu、Co、Zn等共存元素干扰严重。用100mg/L的铁作为基体改进剂可消除上述共存元素的干扰,测定结果令人满意。 相似文献
524.
Massadeh A Al-Sharif L Dalale'h R Hassan M 《Environmental monitoring and assessment》2006,115(1-3):87-93
A total of two hundred and forty random samples were collected equally from mutton, liver and kidney of 40 local (Jordanian) and 40 imported Australian sheep (40 each sub sample). Fresh samples were collected from 12–18 m old sheep slaughtered in abattoirs in Jordan in 2002. Besides, 40 fresh mutton samples of imported Chinese sheep were collected from different markets. Atomic absorption spectrometry (AAS) was used to estimate the lead (Pb) content of the samples. Results indicated that Australian mutton had significantly higher (p < 0.05) mean of lead pollution than that of the local and Chinese muttons. The mean concentration of lead (mg/kg) in Australian, local and Chinese muttons was 4.30, 3.15 and 2.17, respectively. The mean concentration of lead in Australian sheep liver was significantly higher (p < 0.05) than that recorded in the local sheep liver. The mean concentration of Pb in Australian and local sheep liver was 5.69 and 4.52 mg/kg, respectively. The mean concentrations of Pb in the kidney of the Australian and local sheep were not significantly different (p > 0.05). They were 4.59 and 3.87 mg/kg, respectively.On the basis of the samples lead level, 85, 92 and 87.5% of local, Australian and Chinese mutton respectively, exceeded the international safe permissible limit of 1.0 mg/kg. Furthermore, the effect of Pb on animal and human health was discussed. 相似文献
525.
Niedzielski P 《Environmental monitoring and assessment》2006,118(1-3):231-246
This paper presents the results of the determination of arsenic, antimony and selenium concentrations of inorganic speciation
in surface water samples from Gniezno city (western Poland) and its neighborhood. The concentration of elements were up to
1.85 ng/ml for arsenic, 1.61 ng/ml for antimony and 0.45 ng/ml for selenium (detection limits: 0.04 ng/ml for As and Sb and
0.03 ng/ml for Se). A variety of concentrations for the determined elements has been obtained in waters from Gniezno city’s
neighborhood and in water from down-town reservoirs which are under strong anthropogenic pressure. 相似文献
526.
Sierk B Richter A Rozanov A Von Savigny Ch Schmoltner AM Buchwitz M Bovensmann H Burrows JP 《Environmental monitoring and assessment》2006,120(1-3):65-77
The Scanning Imaging Absorption Spectrometer for Atmospheric Chartography (SCIAMACHY) onboard the European Envisat spacecraft performs continuous spectral observations of reflected, scattered and transmitted sunlight in various observation geometries. A unique feature of SCIAMACHY is the capability of probing the atmosphere in three different observation geometries:The nadir, limb, and occultation measurement modes. In nadir mode, column densities of trace gases are retrieved with a spatial resolution of typically 30× 60 km using the Differential Optical Absorption Spectroscopy (DOAS) technique (Platt and Perner, 1983). Alternating with the nadir measurement, vertical profiles of absorber concentration in the stratosphere are derived in limb and occultation. In this paper we present an overview over some applications of SCIAMACHY data in space-based monitoring of atmospheric pollution. The DOAS algorithms for the retrieval of total column amounts from nadir spectra are briefly described and case studies of pollution events are presented. We also illustrate the technique used to derive stratospheric concentration profiles from limb observations and show comparisons with other remote sensing systems. Special emphasis will be given to techniques, which take advantage of SCIAMACHY's different viewing geometries. In particular, we will discuss the potential and limits of strategies to infer tropospheric abundances of O3and NO2. 相似文献
527.
The Status of Pesticide Residues in the Drinking Water Sources in Meiliangwan Bay, Taihu Lake of China 总被引:10,自引:0,他引:10
The study was carried out to assess the levels of pesticide residues in the water of Meiliangwan Bay, Taihu Lake of China. The most commonly employed organochlorine pesticides (OCPs), organophosphorus pesticides (OPPs) and herbicide atrazine were analyzed. The water samples were collected seasonally from Meiliangwan Bay within a period of one year. The pesticides were analyzed by gas chromatography (GC) with μECD or NPD after solid-phase extraction (SPE), which was confirmed by GC with an ion trap mass spectrometry (MS). The mean concentrations were 1.98 ng/l for lindane, 0.378 ng/l for heptachlor epoxide, 0.367 ng/l for p,p′-DDE, 0.496 ng/l for p,p′-DDD, 1.06 ng/l for p,p′-DDT and 51.6 ng/l for dichlorvos, 39.0 ng/l for demeton, 346 ng/l for dimethoate, 4.12 ng/l for methyl parathion, 11.6 ng/l for malathion, 2.17 ng/l for parathion and 217 ng/l for atrazine. Generally, low concentrations of OCP were found, whereas the concentrations of the OPPs and atrazine in the water of Taihu Lake were relatively high. Heptachlor epoxide and lindane were the two most commonly encountered OCPs while dichlorvos, demeton and dimethoate were found to have much higher concentrations and occurrences than other OPPs. 相似文献
528.
529.
微电解-催化氧化-吸附法处理二硝基苯废水 总被引:1,自引:0,他引:1
二硝基苯生产废水具有硝基苯类化合物浓度高,盐量高,难降解等特点.CODCr的平均质量浓度为10 g/L,含盐量达30 g/L.采用微电解-催化氧化-吸附法对该废水进行处理.结果表明:经微电解处理后硝基苯类物质的去除率可达90%以上,铁碳还原后的废水再经催化氧化和活性炭吸附后,废水的CODCr去除率达到96%,硝基苯类物质、色度的去除率接近100%,出水可达到<污水综合排放标准>(GB8978-1996)规定的三级排放标准,是一种效果良好的二硝基苯类废水的处理方法. 相似文献
530.
采用水蒸气蒸馏法对荠菜叶挥发油进行了提取。通过毛细管气相色谱—质谱联用法分离并鉴定了其化学成分,用气相色谱面积归一化法测定了各成分的相对百分含量,共分离确定了其中12种化合物,所鉴定化合物的含量占全油的65.62%,主要化学成分为:L-胍基琥珀酰亚胺(21.28%)、植醇(18%)、植酮(9.6%)、油酸(4.71%)、棕榈酸(3.97%)等。 相似文献