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排序方式: 共有58条查询结果,搜索用时 15 毫秒
1.
2.
研究了PAN—S浸渍树脂对Co^2+的吸附性能。Co^2+吸附pH值范围为4.7—9.2,最佳pH值为5.4;达到最大吸附容量需25min,树脂对Co^2+平衡吸附容量是98mg/g干树脂,达到最大吸附容量平衡时用0.1mol/L的HNO,洗脱,洗脱率达98%。该方法建立了PAN—S-树脂富集一分离钴离子的分光光度测定方法,结果令人满意。 相似文献
3.
This article analyses the world demand for cobalt. It estimates short- and long-run elasticities with respect to price, activity and in some cases with respect to substitute-complement variables. For the USA these estimates have been obtained for all the important end-use categories. Aggregate elasticities are estimated for Japan, West Germany, France and for the non-communist world (excluding the USA). The appendix to the paper models price setting in the cobalt market and presents two simple simulations conducted on the world cobalt market. 相似文献
4.
Sheppard PR Speakman RJ Ridenour G Witten ML 《Environmental monitoring and assessment》2007,130(1-3):511-518
This paper describes the use of lichen chemistry to assess airborne tungsten and cobalt in Fallon, Nevada, where a cluster
of childhood leukemia has been on going since 1997. Lichens and their rock substrates were collected from Rattlesnake Hill
within Fallon as well as from four different rock outcrops located north, east, south, and west of Fallon and at least 20 km
away from the town center. In the lichens themselves, W and Co are significantly higher within Fallon than in the combined
control site outside of Fallon. In the rock substrates of the lichens, no differences exist in W and Co. The W and Co differences
in lichens cannot be attributed to substrate geochemistry. Fallon is distinctive in west central Nevada for high airborne
W and Co, and given its cluster of childhood leukemia, it stands to reason that additional biomedical research is in order
to test directly the leukogenicity of combined airborne W and Co. 相似文献
5.
Andrea Hartwig Ursula Kasten Kwabena Boakye‐Dankwa Regina Schlepegrell Detmar Beyersmann 《毒物与环境化学》2013,95(4):205-215
Literature data concerning the genotoxicity of cobalt salts have been conflicting. To establish appropriate incubation conditions, we conducted a series of uptake studies, before genotoxicity was determined by DNA strand break induction in HeLa cells and mutagenicity in V79 Chinese hamster cells. Co(II) is taken up by HeLa cells in a concentration‐dependent manner and is accumulated inside the cell. The uptake is preceded by a fast association step to the outer membrane, with no saturation up to 24 h. DNA strand breaks as determined by nucleoid sedimentation are induced at concentrations as low as 50μMCoCl2. The induction is time‐dependent, showing the highest number of breaks after 4h incubation with no further increase up to 24h. CoCl2 is mutagenic at the HPRT‐locus, enhancing the spontaneous mutation frequency 4.2‐fold at 100μ?. Besides direct interactions with DNA, the mutagenicity of CoCl2 could also be due to a decrease in the Fidelity of DNA polymerisation. 相似文献
6.
Potentiometric studies of mixed complexes of cobalt(II) and copper(II) with l‐Asparagine and adenine
Hülya Demircan Demir Mürşit Pekin Aysen Kurt Cücü Emre Dölen Hassan Y. Aboul‐Enein 《毒物与环境化学》2013,95(3-4):357-367
A potentiometric titration technique has been used to determine the stability constants for the various complexes of Co(II) and Cu(II) with L‐asparagine and from DNA base, e.g. adenine. Stability constants of ternary systems have been evaluated by the method suggested by Irwing‐Rossotti. In addition, the conditional constants were calculated as a function of pH. The maximum values of the conditional formation constants were found to be in accordance with the mixed‐ligand complex formation constants in a determined pH region. Furthermore, the molar fractions of different species from mixed complexes were calculated by means of formation constants. The values of stability constants of mixed‐ligand complexes at 25°C are as follows: log K= 5.25 for Co(II)‐L‐asparagine‐adenine; log K= 9.30 for Cu(II)‐L‐asparagine‐adenine. The ionic strength was kept constant at I = 0.20 with NaClO4. 相似文献
7.
AbstractA rapid and selective technique for extraction, preconcentration and determination of trace amounts of cobalt in water and pharmaceutical samples by air-assisted liquid–liquid microextraction combined with flame atomic absorption spectrometry is proposed. 1-Nitroso-2-naphthol is used as a complexing agent and 1-octanol as an extraction solvent. Parameters relevant for analytical effectivity, i.e. pH of sample solution, concentration of complexing agent, volume of extraction solvent, and number of extraction cycles are optimized using a Box–Behnken design. At optimum conditions, a dynamic linear range of 5–600?µg L?1 is obtained, with a limit of detection of 1.2?µg L?1. The method is used for determination of Co(II) in environmental water and pharmaceutical samples. 相似文献
8.
Due to the fact that, among the different chemical species, metallic cobalt is characterized by the highest toxicity, in this paper is proposed a procedure for its determination in the atmospheric paniculate. The air is filtered on a cellulose or glass fiber membrane, to collect the paniculate containing among the other species, metallic cobalt: the determination is based on a selective dissolution of the metallic cobalt possibly present followed by its determination by atomic absorption spectroscopy. The typical interferences that can be present in the matrix are discussed and suggestions for their minimisation are proposed. By the following procedure is also possible to determine separately the sum of the insoluble and water soluble cobalt compounds. 相似文献
9.
《环境科学学报(英文版)》2023,35(2):42-49
Growing studies have linked metal exposure to diabetes risk. However, these studies had inconsistent results. We used a multiple linear regression model to investigate the sex-specific and dose-response associations between urinary metals (cobalt (Co) and molybdenum (Mo)) and diabetes-related indicators (fasting plasma glucose (FPG), hemoglobin A1c (HbA1c), homeostasis model assessment for insulin resistance (HOMA-IR), and insulin) in a cross-sectional study based on the United States National Health and Nutrition Examination Survey. The urinary metal concentrations of 1423 eligible individuals were stratified on the basis of the quartile distribution. Our results showed that the urinary Co level in males at the fourth quartile (Q4) was strongly correlated with increased FPG (β = 0.61, 95% CI: 0.17–1.04), HbA1c (β = 0.31, 95% CI: 0.09–0.54), insulin (β = 8.18, 95% CI: 2.84–13.52), and HOMA–IR (β = 3.42, 95% CI: 1.40–5.44) when compared with first quartile (Q1). High urinary Mo levels (Q4 vs. Q1) were associated with elevated FPG (β = 0.46, 95% CI: 0.17–0.75) and HbA1c (β = 0.27, 95% CI: 0.11–0.42) in the overall population. Positive linear dose-response associations were observed between urinary Co and insulin (Pnonlinear = 0.513) and HOMA–IR (Pnonlinear = 0.736) in males, as well as a positive linear dose-response relationship between urinary Mo and FPG (Pnonlinear = 0.826) and HbA1c (Pnonlinear = 0.376) in the overall population. Significant sex-specific and dose-response relationships were observed between urinary metals (Co and Mo) and diabetes-related indicators, and the potential mechanisms should be further investigated. 相似文献
10.
《环境科学学报(英文版)》2023,35(4):263-274
The cryptomelane-type manganese oxide (OMS-2)-supported Co (xCo/OMS-2; x = 5, 10, and 15 wt.%) catalysts were prepared via a pre-incorporation route. The as-prepared materials were used as catalysts for catalytic oxidation of toluene (2000 ppmV). Physical and chemical properties of the catalysts were measured using the X-ray diffraction (XRD), Fourier transform infrared spectroscopic (FT-IR), scanning electron microscopic (SEM), X-ray photoelectron spectroscopy (XPS), and hydrogen temperature-programmed reduction (H2-TPR) techniques. Among all of the catalysts, 10Co/OMS-2 performed the best, with the T90%, specific reaction rate at 245°C, and turnover frequency at 245°C (TOFCo) being 245°C, 1.23 × 10−3 moltoluene/(gcat·sec), and 11.58 × 10−3 sec−1 for toluene oxidation at a space velocity of 60,000 mL/(g·hr), respectively. The excellent catalytic performance of 10Co/OMS-2 were due to more oxygen vacancies, enhanced redox ability and oxygen mobility, and strong synergistic effect between Co species and OMS-2 support. Moreover, in the presence of poisoning gases CO2, SO2 or NH3, the activity of 10Co/OMS-2 decreased for the carbonate, sulfate and ammonia species covered the active sites and oxygen vacancies, respectively. After the activation treatment, the catalytic activity was partly recovered. The good low-temperature reducibility of 10Co/OMS-2 could also facilitate the redox process accompanied by the consecutive electron transfer between the adsorbed O2 and the cobalt or manganese ions. In the oxidation process of toluene, the benzoic and aldehydic intermediates were first generated, which were further oxidized to the benzoate intermediate that were eventually converted into H2O and CO2. 相似文献