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71.
Investigation and risk assessment modeling of As and other heavy metals contamination around five abandoned metal mines in Korea 总被引:3,自引:0,他引:3
Tailings, agricultural soils, vegetables and groundwater samples were collected from abandoned metal mines (Duckum, Dongil,
Dongjung, Myoungbong and Songchun mines) in Korea. Total concentrations of arsenic (As) and heavy metals (Cd, Cu, Pb and Zn)
were analyzed to investigate the contamination level. Several digestion methods (Toxicity characteristics leaching procedure
(TCLP), synthetic precipitation leaching procedure (SPLP), 0.1 N/1 N HCl) and sequential extraction analysis for mine tailings
were conducted to examine the potential leachability of As and heavy metals from the tailings. The order of urgent remediation
for the studied mines based on the risk assessment and remedial goals was suggested.
The Songchun mine tailings were most severely contaminated by As and heavy metals. Total concentrations of As and Pb in the
tailings were 38,600–58,700 mg/kg (av. 47,400 mg/kg) and 11,800–16,800 mg/kg (av. 14,600 mg/kg), respectively. Agricultural
soils having high As concentrations were found at the all mines. Average concentrations of Cd in the vegetables exceeded the
normal value at all mines areas, while As only at the Dongjung, Myoungbong, and Songchun mine area. One groundwater sample
each from the Dongil and Myoungbong mines, and 4 groundwater samples from the Songchun mine had values above 10 μg/L of As
concentration.
The TCLP method revealed that only Pb in the Songchun tailings, 6.49 mg/L, exceeded the regulatory level (5 mg/L). Employing
the 1-N HCl digestion method, the concentration of As in the Songchun mine tailings, 4,250 mg/kg, was up to 3,000 times higher
than its Korean countermeasure standard. Results from the sequential extraction of As in the tailings showed that the easily
releasable fraction in the Myoungbong and Songchun mine tailings was more than 30% and the residual fraction was less than
40%.
Based on results showing the exposure health risk employing the hazard quotient and cancer risk of As, Cd and Zn, the Dongil
mine needs the most urgent remedial action. The concentration reduction factor (CRF) of As in both soil and groundwater follows
the order: Songchun>Dongjung>Dongil>Myoungbong>Duckum mine. 相似文献
72.
Monitoring the impact of dissolved oxygen and nitrite on anoxic biofilm in continuous denitrification process 总被引:1,自引:0,他引:1
An anoxic biofilm involved in continuous denitrificationprocess was monitored to investigate the effect of differentconcentrations of influent dissolved oxygen (DO) or nitrite onthe biofilm. Microelectrode measurements evidenced nitrateremoval activity of biofilm. When different concentrations ofDO were applied to the reactor, generally decreasedconcentrations of DO were observed as bed depth increased fromthe bottom of the reactor. Greatest decrease of the DO wasobserved in the lower 20% of the bed depth. Nitrate removalefficiency was inversely proportional to influent DOconcentrations (8.3-11.9 DO mg L-1) or nitrite loadingrates (0-5.5 N-NO2
- kg m-3 day-1) employed in this study. Nitrite loading rates to achieve morethan 90% of nitrate removal efficiency were 1.46 N-NO2
-kg m-3 day-1 or less at pH 7.5 and 0.34 N-NO2
- kg m-3 day-1 or less at pH 6.8. Nitrate removal efficiency was 63% or more within the lower 20% of the bed depth at the nitrite loading rates that allowed more than 90% of nitrate removal efficiency of the reactor. The results of this study provide first quantitative data that nitrate removalperformance of an anoxic biofilm is inhibited by DO or nitrite,reported to be a limiting factor in the suspended biologicaldenitrification process. 相似文献
73.
74.
Muccillo-Baisch AL Mirlean N Carrazzoni D Soares MC Goulart GP Baisch P 《Environmental geochemistry and health》2012,34(1):43-53
Rio Grande, the southernmost Brazilian port and industrial center, is marked by mercury-polluted ground cover. This pollution
varies spatially, with levels exceeding 1,000 μg kg−1 in 30% of the urban territory. The risk of Hg impact as a result of deliberate and involuntary geophagy is increased by restrained
urban conditions in combination with the large proportion of the population living at low-income levels. Laboratory tests
have demonstrated that ingestion of Hg-polluted soil by rats results in significant alterations in animal health such as stagnation
in body weight increase, and significant mercury accumulation in the liver and kidney. The consumption of Hg-contaminated
urban soil also provoked changes in hematological profiles of experimental animals by increasing the number of platelets.
The present study indicates the potential for the local population of Rio Grande living in mercury-polluted districts, specifically
young children, to experience health disturbances. 相似文献
75.
Kim Won-Seok Han Sangsoo Ahn Jinmo Um Wooyong 《Environmental geochemistry and health》2019,41(1):411-425
Environmental Geochemistry and Health - Batch adsorption, batch diffusion, and flow-through column experiments were conducted using groundwater and fractured rock collected in unsaturated zone to... 相似文献
76.
The characteristics of Hg wet deposition were investigated in a rural area of Korea from August 2006 to July 2008. The volume weighted mean (VWM) Hg(T) concentration and cumulative Hg(T) flux were 8.8 ng L(-1) and 9.4 μg m(-2) per year, respectively. The VWM Hg(T) concentration varied seasonally, similar to the seasonal pattern in atmospheric Hg(p) concentration. The enhancement of both VWM Hg(T) and atmospheric Hg(p) concentrations in spring and winter was likely caused by the long-range transport of Hg from China. Monthly VWM Hg(T) and atmospheric Hg(p) concentrations were well correlated (R(2) = 0.36); however, there was no correlation between VWM Hg(T) and RGM (reactive gaseous mercury) concentrations, suggesting that Hg(p) was responsible for the majority of the Hg in wet deposition at this site. The VWM Hg(T) concentration in snow was statistically higher than in rain. In addition, the atmospheric Hg(p) concentration appeared to be elevated for snow events as well. This suggests that both elevated Hg(p) concentrations and the enhanced scavenging efficiency of snow for Hg(p) were responsible for the elevated VWM Hg(T) concentrations measured during snow events. 相似文献
77.
Khan Muhammad Saiful Islam Lee Na Ri Ahn Jaehwan Kim Ji Young Kim Jong Hoon Kwon Ki Hyun Kim Yun-Ji 《Environmental science and pollution research international》2021,28(7):8296-8309
Environmental Science and Pollution Research - Pesticides are emergent toxins often identified in aquatic environments. In the present study, microplasma was employed to reduce the pesticide... 相似文献
78.
Plant origin of Okinawan propolis: honeybee behavior observation and phytochemical analysis 总被引:1,自引:0,他引:1
Kumazawa S Nakamura J Murase M Miyagawa M Ahn MR Fukumoto S 《Die Naturwissenschaften》2008,95(8):781-786
Propolis is a natural resinous product collected by honeybees from certain plants. It has gained popularity as a food and
alternative medicine. Poplar and Baccharis are well known as the source plants of European and Brazilian propolis, respectively. However, the propolis from Okinawa,
Japan, contains some prenylflavonoids not seen in other regions such as Europe and Brazil, suggesting that the plant origin
of Okinawan propolis is a particular plant that grows in Okinawa. To identify the plant origin of Okinawan propolis, we observed
the behavior of honeybees as they collected material from plants and caulked it inside the hive. Honeybees scraped resinous
material from the surface of plant fruits of Macaranga tanarius and brought it back to their hive to use it as propolis. We collected samples of the plant and propolis, and compared their
constituents by high-performance liquid chromatography with a photo-diode array detector. We also compared their 1,1-diphenyl-2-picryl-hydrazyl
radical scavenging activity. The chemical constituents and biological activity of the ethanol extracts of the plant did not
differ from those of propolis. This indicates directly that the plant origin of Okinawan propolis is M. tanarius.
S. K. and J. N. contributed equally to this work. 相似文献
79.
Comparisons of polybrominated diphenyl ethers levels in paired South Korean cord blood, maternal blood, and breast milk samples 总被引:1,自引:0,他引:1
Kim TH Bang du Y Lim HJ Won AJ Ahn MY Patra N Chung KK Kwack SJ Park KL Han SY Choi WS Han JY Lee BM Oh JE Yoon JH Lee J Kim HS 《Chemosphere》2012,87(1):97-104
Polybrominated diphenyl ethers (PBDEs), commonly used flame retardants, have been reported as potential endocrine disruptor and neurodevelopmental toxicants, thus giving rise to the public health concern. The goal of this study was to investigate the relationship between umbilical cord blood, maternal blood, and breast milk concentrations of PBDEs in South Korean. We assessed PBDE levels in paired samples of umbilical cord blood, maternal blood, and breast milk. The levels of seven PBDE congeners were measured in 21 paired samples collected from the Cheil Woman’s Hospital (Seoul, Korea) in 2008. We also measured thyroid hormones levels in maternal and cord blood to assess the association between PBDEs exposure and thyroid hormone levels. However, there was no correlation between serum thyroxin (T4) and total PBDEs concentrations. The total PBDEs concentrations in the umbilical cord blood, maternal blood, and breast milk were 10.7 ± 5.1 ng g−1 lipid, 7.7 ± 4.2 ng g−1 lipid, and 3.0 ± 1.8 ng g−1 lipid, respectively. The ranges of total PBDE concentrations observed were 2.28-30.94 ng g−1 lipid in umbilical cord blood, 1.8-17.66 ng g−1 lipid in maternal blood, and 1.08-8.66 ng g−1 lipid in breast milk. BDE-47 (45-73% of total PBDEs) was observed to be present dominantly in all samples, followed by BDE-153. A strong correlation was found for major BDE-congeners between breast milk and cord blood or maternal blood and cord blood samples. The measurement of PBDEs concentrations in maternal blood or breast milk may help to determine the concentration of PBDEs in infant. 相似文献
80.
Myung-Chan Ahn Thomas M. Holsen Young-Ji Han 《Environmental pollution (Barking, Essex : 1987)》2010,158(2):347-355
The effects of various factors including turbidity, pH, DOC, temperature, and solar radiation on the concentrations of total mercury (TM) and dissolved gaseous mercury (DGM) were investigated in an artificial reservoir in Korea. Episodic total mercury accumulation events occurred during the rainy season as turbidity increased, indicating that the TM concentration was not controlled by direct atmospheric deposition. The DGM concentration in surface water ranged from 3.6 to 160 pg/L, having a maximum in summer and minimum in winter. While in most previous studies DGM was controlled primarily by a photo-reduction process, DGM concentrations tracked the amount of solar radiation only in winter when the water temperature was fairly low in this study. During the other seasons microbial transformation seemed to play an important role in reducing Hg(II) to Hg(0). DGM increased as dissolved organic carbon (DOC) concentration increased (p-value < 0.01) while it increased with a decrease of pH (p-value < 0.01). 相似文献