Papers by Keyword: Mercury

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Authors: Anne Henry, Bo Monemar, Peder Bergman, J. Lennart Lindström, Y. Zhang, James W. Corbett
Authors: Lei Zhang
Abstract: In order to understand the pollution status of mercury in fish and shellfish products from the Jiaozhou Bay and its health mercury risk for the population, a total of 86 samples for 13 kinds of seafood products from Shuangbu, Hongdao, Yinghai and Huangdao in Jiaozhou Bay were collected from April to May 2009. The mercury content in samples was determined by the method of cold atomic absorption method used F732-V mercury detector. The result of this experiment showed that the range of mercury contents in the collected fish and shellfish samples were 0.0044-0.4895 mg/kg. The mercury content in Psetta maxima had the highest value in all fish samples collected, and Clinocardium californiense had the highest mercury content in shellfish samples gathered. The fish and shellfish samples from Hongdao had the highest average mercury contents in all the four origin regions, and that in Huangdao had the lowest average mercury content. There were 16.67% of Ruditapes philippinarum samples over the national standard of China, and the data was 33.33%, 50%, and 50% for Clinocardium californiense, Psetta maxima, and Mylopharyngodon piceus, repectively. Population has a certain health risk for mercury exposure from the consumption of fish and shellfish in Jiaozhou Bay.
Authors: Tao Ge
Abstract: The mercury content in the raw coal is one of the important basic data to estimate the mercury emission of the coal. The outcome of the test and analysis of the mercury content in the raw coal of the 9 mines in Huainan Coalfield has shown that the mercury content in the coal samples of Huainan, although higher than that in the coal of the United States,Russia,Germany,Australia,etc., is within the normal range, with no major differences from that of the coal in North China region. With a research into the content change of the mercury in the coal in the process of washing and in combination with the relevant analysis result of the relation between the mercury in the coal and sulfur, ash content, selenium, we have inferred that the mercury in the coal of Huainan is existing naturally in the minerals, but has come into combination with organic matter in some way or scattered in the organic groups in the form of particles.
Authors: Yea Seul Kim, Woo Keun Lee
Abstract: Significant amounts of fluorescent light have been discarded every year. Mercury is released into the atmosphere in the recycling process of it, if improperly treated. The adsorption method is used to remove mercury discharged from the recycling step of fluorescent light.We studied the impregnation condition of adsorbent made from sewage sludge. And also adsorption characteristics of mercury were evaluated by impregnated adsorbent.According to our results, the adsorption efficiency of mercury was increased by impregnating adsorbent with chlorine and iodine. The adsorption capacity was described by Langmuir isotherm model.
Authors: Dong Zhang, Yan Li Zhang
Abstract: A new method for the determination of traces of mercury in environmental and biological samples is described. The present methodology combines determined using a hydride generation-atomic absorption spectrometry (HG-AAS) with pre-concentration/separation of the analyte on dithizone-anchored organobentonite (D-O-bentonite). Optimal experimental conditions for the adsorption of the Hg, including pH, contact time, eluent concentration and volume and co-existing ions have been studied. The result showed that the mercury could be adsorbed on the D-O-bentonite. The adsorbed quantitively was affected by the pH value of medium and contact time. In the medium of pH 5.0, the adsorption time was 15 min, and capacity of adsorption was 23.2 mg·g-1. The mercury adsorbed on the sorbent could be completely eluated by using 3 mol·L-1 HCl. The adsorption agent has been applied to the pre-concentration/separation of mercury in surface water and human hair samples with satisfied results.
Authors: Hui Zhu, Bai Xing Yan
Abstract: The correlative and partial correlative analysis as well as plural factors analysis of variance among Hg, Fe, Mn and organic matter in sediments of the Songhua River were conducted. Results of correlative analysis showed that Hg was positively related to Fe, Mn and organic matter. When eliminated Fe and Mn, Fe and organic matter, Mn and organic matter, respectively, results of the partial correlative analysis showed that Hg was still positively related to Fe. However, the correlations of Hg and other components disappeared. The results of variance analysis showed high contribution ratio (85.1%) of Fe to squared deviation of Hg. Therefore, Fe was the dominant factor affected Hg and its distribution.
Authors: Dong Fang Yang, Feng You Wang, Si Xi Zhu, Xiu Qing Yang, Yun Jie Wu
Abstract: We analyzed the pollution sources and transfer processes of mercury (Hg) in Jiaozhou bay based on the investigation data during time periods of 1979 to 1985 (absent of 1984), and then proposed the transfer mechanism of Hg in waters. The high or low of Hg contents in surface and bottom waters in different regions could be defined based on the transfer mechanism.
Authors: Bin Li, Ping Ning, Yun Tao Gao, Hong Bin Wang
Abstract: BCR three-step extraction method was used to evaluate the speciation of mercury in mining area soil. The results showed that the major existent form of mercury in NO.1 and NO.3 area were acid-soluble speciation, the major existent form of mercury in NO.2 and NO.4 area were nitric acid-soluble speciation, and the total content of mercury in entrance area, shade area, sunny area and low-lying area were 419.977 mg/kg, 182.945 mg/kg, 290.313 mg/kg and 798.718 mg/kg, respectively. The bioavailability of mercury in mining area soil was evaluated based on BCR speciation. Acid-soluble speciation, nitric acid-soluble speciation and oxidation speciation were considered to be potential bioavailability.
Authors: Ping Yang, Yong Cheng
Abstract: Established the analytical method by using ultrasonic vibration - suspension of solid sampling graphite furnace atomic absorption spectrometry (GF-AAS) to test trace mercury in the titanium dioxide, by choosing a suitable concentration of agar solution as dispersing agent, and taking the ultrasonic oscillation technique to prepare uniform and stable titanium dioxide suspended solid solution, and finally using the solid injection sampling GF-AAS method to test trace elements of mercury.. Through the application of solid injection technique, the problem that the titanium dioxide is extremely difficult to digest and mercury volatile loss are solved and the matrix effect of the high titanium is eliminated by standard addition method as well. The paper has tested the conditions of preparation of solid suspension such as agar dispersing agent concentration, dosage, and ultrasonic vibration parameters. and titanium dioxide solid suspensions obtained by the method have the characters of uniformity, stability, mobility features, and preserve a long time. Graphite furnace testing procedures are also optimized: drying temperature 85 °C, time 30 s, by lowering the drying temperature and measures to extend the time to solve the contradiction of water evaporation and mercury volatilization; cancel the ashing step directly into the atomization stage in order to avoid mercury loss after drying. Finally, set atomic temperature 1 000 °C, for 5 s and close the purged argon flow of the internal graphite tube to ensure mercury exists as different forms such as free, particle adsorption or parcels can be effective tested. The detection limit is from 0.000 to 005% and recovery rate is from 93% to 109%, RSD <3.1%. The results of the test is correspond with that of Microwave Digestion and Inductively Coupled Plasma Mass Spectrometry method. The methods can meet the requirement of testing toxic trace elements mercury in high-grade titanium dioxide which used in medical, food, ceramics and other field.
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