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C. Wagner G. Schuster J.N. Crowley 《Atmospheric environment (Oxford, England : 1994)》2009,43(32):5001-5008
The interaction of N2O5 with dispersed samples of Arizona Test Dust (ATD), Calcite (CaCO3) and quartz (SiO2) was investigated at varying relative humidity using an aerosol flow reactor. Reactive uptake coefficients, γ, obtained at close to zero relative humidity were (4.8 ± 0.7) × 10−3 for CaCO3, (8.6 ± 0.6) × 10−3 for Quartz and (9.8 ± 1.0) × 10−3 for ATD. In the case of calcite, evidence was obtained for an enhanced rate of uptake at relative humidities above ≈ 50%. The results are compared to literature values obtained using bulk substrates and to previous aerosol uptake data on Saharan dust. 相似文献
34.
利用碘消除碱性和中性溶液中硫化物及硫代硫酸盐对 Cr+ 6 测定的干扰 ,经实验找出了含硫化物和硫代硫酸盐工业废水中 Cr+ 6的测定方法 相似文献
35.
This paper deals with some endemic diseases related to selenium, iodine and fluoride in eco-environment. Keshan disease and Kaschin-Beck disease are associated with low selenium, they mainly occur in a belt zone across China ranging from North-East to South-West. Selenium contents in food grains and human hair from the disease affected areas are usually below 0.020ppm and 0.20ppm respectively. The endemic goitre caused by iodine deficiency distributes extensively in China, mainly in mountainous and hilly districts, swamp and peat areas, some sand soil and limestone areas. Also there is another kind of endemic goitre which caused by iodine excess in interior and coast areas. Endemic cretinism usually occurs in the endemic goitre seriously affected areas. Endemic fluorosis is also widely distributed in China, but mainly occurs in dry or semi-dry areas of north China. The fluoride sources for causing endemic fluorisis are drinking water and food grains polluted by coal smoke in the backing process of maize 相似文献
36.
Preparation of iodine doped titanium dioxide to photodegrade aqueous bisphenol A under visible light
Highly photoactive iodine-doped titanium dioxide (I-doped TiO2) photocatalysts were synthesized to degrade aqueous bisphenol A (BPA) under irradiation by visible light and sunlight. The band gap energies of TiO2 and I-doped TiO2 (I/Ti mole ratio = 0.5%) were 3.01 and 3.04, and the BPA photodegradation rate constants were 1.61, and 5.11 h−1, respectively. The most probable reaction mechanism was proposed to involve IO4− and IO3− as electron acceptors that generate an inductive effect, increasing the photocatalytic efficiency of TiO2. Results indicated that I-doped TiO2 not only acted favorably as a photocatalyst, but also exhibited considerable mineralization effects. In addition, a recycling test after ten experiments demonstrated the stability and reusability of the photocatalyst. 相似文献
37.
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
38.
本文研究结果表明,在自然环境缺碘地区持续投放含碘浓度25ppm 的“NaCLI—固”后出生的儿童身高体重发育水平接近对照地区的中等水平;缺碘地区儿童甲状腺激素 T_4、T_3、T_4/T_3比值均在正常范围,甲状腺功能状态基本正常,提示机体内环境缺碘程度已得到纠正;缺碘区儿童 IQ 低下检出率明显高于对照区,血清 Zn 水平则无显著性差异,表明这部分低智儿童与在胚胎期间碘元素相对缺乏有着密切关系. 相似文献
39.
A robust and rapid methodology for the determination of iodine by inductively coupled plasma mass spectrometry in environmental
samples is presented. Data were initially obtained for the validation of the analytical measurements, using 17 commercially
available soil reference materials. The methodology was then tested on soil and water samples collected in Afghanistan where
iodine deficiency and its effects are reportedly prevalent. Sample collections were conducted in Greater Kabul; the iodine
in agricultural soils was determined to be in the range of 1.6–4.2 mg/kg and that in water drawn for drinking and irrigation
was found to range from 9.9 to 22.7 μg/L. Samples were also collected in a second region, Nangarhar province, which is located
to the east of Kabul, where goitres in the local population had been reported. The iodine content in soils and water at this
location was 0.5–1.9 mg/kg and 5.4–9.4 μg/L, respectively. The organic content of soils in Kabul was found to be in the range
of 1.9–4.2%; in Nangarhar, organic content ranged from 1.7 to 4.5%. All of the Afghan soils were slightly alkaline at pH 7.6–8.2. 相似文献
40.
于2022年1月2~17日在深圳进行了为期15d的观测,基于化学电离飞行时间质谱仪器(ToF-CIMS)对气态N2O5和HNO3进行了现场测量.冬季N2O5的夜间平均浓度为(174.3±262.0)×10-12,最高可达到4535.1×10-12.较高的N2O5反应活性表明夜间化学活动活跃,τ(N2O5)-1平均值在8.3×10-2s-1,通过N2O5非均相水解反应形成的硝酸盐潜力大.通过对NO、NO2、O3和pNO3-的同步测量,量化表征了深圳市冬季夜间活性氮的化学行为;此外,通过奇数氧的收支分析发现,夜间HNO3和pNO3-占据了Ox的主要成分且当(HNO3+ pNO3-)系数为1.5时收支闭合,这表明N2O5的非均相水解是冬季夜间Ox去除的关键机制. 相似文献