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排序方式: 共有87条查询结果,搜索用时 31 毫秒
81.
过硫酸钾溶液对测定总氮的影响 总被引:1,自引:0,他引:1
通过对过硫酸钾的配制方法,加热时的水浴温度,反应介质条件及其纯度等因素对总氮测定结果影响的讨论,提出了过硫酸钾有效的配制方法及其纯度要求,以进一步提高总氮测定的准确度. 相似文献
82.
在柠檬酸介质中,I-对KIO3氧化结晶紫的反应有催化效应,据此建立了测定微量I-新的催化动力学光度法.方法的检出限为0.185μg/ml,测定范围为5~70μg/25ml,用本法对环境水样进行了测定,结果满意。 相似文献
83.
Mineral dust, soil, and sea salt aerosols are among the most abundant primary inorganic aerosols in the atmosphere, and their hygroscopicity affects the hydrological cycle and global climate. We investigated the hygroscopic behaviors of six Na- and K-containing salts commonly found in those primary organic aerosols. Their hygroscopic growths as a function of relative humidity (RH) agree well with thermodynamic model prediction. Temperature dependence of deliquescence RH (DRH) values for five of those salts was also investigated, which are comparable to those in literature within 1%–2% RH, most showing negative dependence on temperature. Hygroscopic growth curves of real-world soil and sea salt samples were also measured. The hygroscopic growths of two more-hydroscopic saline soil samples and of sea salt can be predicted by the thermodynamic model based on the measured water-soluble ionic composition. The substantial amounts of water-soluble ions, including Na+ and K+, in saline soil samples imply that even nascent saline soil samples are quite hygroscopic at high-RH (>80%) conditions. For three less-hygroscopic dust samples, however, measurements showed higher water uptake ability than that predicted by the thermodynamic model. The small amount of water taken up by less-hygroscopic dust samples suggests that dust particles might contain thin layers of water even to very low RH. The results of this study provide a comprehensive characterization of the hygroscopicity of Na- and K-containing salts as related to their roles in the hygroscopic behaviors of saline mineral dusts and sea salt aerosols. 相似文献
84.
Pentachlorophenol (PCP) in contaminated soil was removed by treatment with aqueous solutions of iron(III)-porphyrin complexes as catalysts and potassium monopersulfate (KHSO5) as the oxygen donor. The contaminated soils were artificially prepared by spiking PCP to the kaolin and ando soils. Three types of iron(III)-porphyrin complexes, tetra(?p-sulfophenyl) porphineiron(III) (Fe(III)-TPPS), tetra(N-methyl-4-pyridil)porphineiron(III) (Fe(III)-TMPyP) and heme, were examined, and Fe(III)-TPPS was found to be the most effective for removing PCP. Although the sequential addition of KHSO5 was examined, in an attempt to improve the efficiency of PCP removal, it was not effective. In a preliminary test of various aqueous solutions, the addition of humic acid (HA), with a lower degree of humification, led to a significant enhancement in PCP removal. When HA was added to the soil system, the percentages of PCP removal were increased by up to 10% compared to the absence of HA. Therefore, the addition of HA to the catalytic system was useful in enhancing PCP removal from contaminated soil. 相似文献
85.
Gamma radiation measurements and dose rates in commercially-used natural tiling rocks (granites) 总被引:2,自引:0,他引:2
Tzortzis M Tsertos H Christofides S Christodoulides G 《Journal of environmental radioactivity》2003,70(3):223-235
The gamma radiation in samples of a variety of natural tiling rocks (granites) imported in Cyprus for use in the building industry was measured, employing high-resolution gamma-ray spectroscopy. The rock samples were pulverised, sealed in 1-l plastic Marinelli beakers, and measured in the laboratory with an accumulating time between 10 and 14 h each. From the measured gamma-ray spectra, activity concentrations were determined for (232)Th (range from 1 to 906 Bq kg(-1)), (238)U (from 1 to 588 Bq kg(-1)) and (40)K (from 50 to 1606 Bq kg(-1)). The total absorbed dose rates in air calculated from the concentrations of the three radionuclides ranged from 7 to 1209 nGy h(-1) for full utilization of the materials, from 4 to 605 nGy h(-1) for half utilization and from 2 to 302 nGy h(-1) for one quarter utilization. The total effective dose rates per person indoors were determined to be between 0.02 and 2.97 mSv y(-1) for half utilization of the materials. Applying dose criteria recently recommended by the EU for superficial materials, 25 of the samples meet the exemption dose limit of 0.3 mSv y(-1), two of them meet the upper dose limit of 1 mSv y(-1) and only one clearly exceeds this limit. 相似文献
86.
87.
为加强大型蚤急性毒性试验的质量控制,采用重铬酸钾作为参考毒物分析了不同日龄母蚤所产幼蚤的毒性效应变化。研究发现,在大型蚤急性毒性试验中,对于在11~56日龄期间的母蚤,以35日龄母蚤所产幼蚤对重铬酸钾的敏感度最高,47日龄母蚤所产幼蚤的敏感度最低。在一定范围内,提高稀释水硬度可显著降低大型蚤对重铬酸钾的敏感度。重铬酸钾的24h-EC 50值的实验室精密度以29~42日龄母蚤组所产幼蚤最好,其次为15~28日龄母蚤组;经t检验,大于42日龄母蚤组所产幼蚤对重铬酸钾24h-EC 50值与15~28日龄母蚤组有显著性差异(P<0.05),与29~42日龄母蚤组有高度显著性差异(P<0.01),表明以20℃为大型蚤培养温度时,大型蚤毒性试验宜选用15~42天母蚤所产幼蚤。进行大型蚤急性毒性试验时,应定期使用参考毒物检查毒性试验的实验精密度并运用质量控制图来验证持续的实验室能力。 相似文献