Dissertation
Dissertation > Environmental science, safety science > Environmental Quality Assessment and Environmental Monitoring > Environmental monitoring > Water quality monitoring

Determination of Dissolved Inorganic Antimony Species (Sb(V) and Sb(Ⅲ)) in Natural Water and Their Distributions in the Yellow River Estuary and the Yellow Sea

Author WanYuXia
Tutor RenJingLing
School Ocean University of China
Course Analytical Chemistry
Keywords Dissolved inorganic antimony form Atomic Fluorescence Spectrometry Distributed Yellow River Mouth Yellow Sea
CLC X832
Type Master's thesis
Year 2010
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Antimony is a global pollutant, is one of the most concerned about the toxic metals in the international. In recent years, the level of consumption of antimony in the world is about 12-15 million tons / year more and more serious, due to the widespread use of antimony resulting in environmental pollution levels of antimony. Compared with other toxic metals (such as arsenic and mercury, etc.), relatively few studies on antimony, and antimony biogeochemical cycles and the level of environmental pollution is also a lack of understanding. Domestic Method for determination of different forms of antimony is relatively small, the distribution of the different forms of antimony in the shelf edge of the sea and major rivers have not been reported, therefore, reveal the the antimony global pollution levels and cycle on the ecological environment impact, it is urgent to carry out in-depth research. Of Yellow River and the Yellow Sea, the thesis as the research object, the system recognizes the Yellow River mouth and the Yellow Sea in the concentration and distribution of the different forms of antimony the understanding obtained as follows: 1 of the thesis of natural water Sb (III-V) and Sb ( III) atomic fluorescence spectrometric method. And select the best instrument conditions: lamp current 60 mA, the negative high voltage of -260 V, the atomizer temperature of 190 ° C and an argon carrier gas flow rate of 600 mL / min. Sb (III-V) were measured in 1 mol / L HCl medium, the detection limit was 0.024μg / L, the linear range of 0-14μg / L, the concentration of 0.3μg / L and 0.03μg / L sample analytical precision 2.0% and 1.9% (n = 9), 93.7% -105% of the recoveries. Sb (III) is, in the citric acid and sodium citrate buffer solution (pH = 4.0-4.5), supplemented with of 100mL/min the hydrogen is measured, the measured detection limit 0.0013μg / L, the concentration of 0.04μg / L and 0.01μg / L of sample analysis precision of 3.8% and 5.5% (n = 9), 91.1% to 104% of the recoveries. The slope of the curve changes in the scope of both work in different media are less than 5%. The method is suitable for natural waters Sb (III V) and Sb (III) determination. (2) observation of the Yellow River May, the date of observation and the process of the Xiaolangdi tune flow (V) and Sb (III) the distribution of the Yellow River mouth Sb survey showed that: Sb (V) and suspended particulate matter concentration and diameter flow of seasonal changes in trends are basically the same , its content is highest in summer, spring, autumn, winter minimum. Sb (V) annual average content of 6.46 nmol / L. Sb (V) observations in June-July 2009, the average was 8.06 ± 1.00 nmol / L, range 7.12-11.07 nmol / L, SPM average of 2.35 1.62 g / L, ranged from 0.09 -5.11 g / L, Kenli pontoon Day observation value of the average content of Sb (V) is much higher than the average near the mouth of the Yellow River Sb (V) further show that was to adjust the flow of the diluted water of the Yellow River Yellow River mouth during major source of antimony. The Xiaolangdi water diversion before the Yellow River Estuary waters Sb (III) and Sb (Ⅴ Ⅲ) average concentration, respectively, to 0.54 ± 0.14 nmol / L and 3.45 ± 1.00 nmol / L, Sb (Ⅲ) / Sb (V) ratio to 0.17 ± 0.07; Yellow River estuary waters the Xiaolangdi water transfer process Sb (III) and Sb (Ⅴ Ⅲ) the average concentration to 0.44 ± 0.25 nmol / L and 4.55 ± 1.28 nmol / L, Sb (III) / Sb (Ⅴ) the ratio for the 0.10 ± 0.07; Xiaolangdi Water Diversion Yellow River Estuary Sb (III) and Sb (Ⅴ Ⅲ) the average concentration, respectively, to 0.08 ± 0.06 nmol / L and 3.35 ± 1.01 nmol / L, Sb (Ⅲ) / Sb (Ⅴ) of ratio of 0.03 ± 0.02. By the survey data shows that the contribution of the Yellow River to the Bohai Sea is very obvious, the main source of Bohai Sb (V). Yellow River mouth Sb (III) the distribution trend of the coast to the central sea increments, each of the stations the underlying concentrations were slightly higher than the surface, the impact of Sb (III) the existence of factors is unclear. 3 Yellow Sea in winter voyage surface Sb (V) and Sb (III) the average concentration of 1.95 ± 0.51 nmol / L and 0.31 ± 0.11 nmol / L, the underlying Sb (V) and Sb (III) the average concentrations were 1.95 ± 0.56 nmol / L and 0.30 ± 0.14 nmol / L; Spring Voyage surface SB (V) and Sb (III) concentrations were 1.91 ± 0.34nmol / L and 0.30 ± 0.09 nmol / L, the underlying Sb (V) and Sb (III) the average concentrations were 1.87 ± 0.38nmol / L and 0.29 ± 0.07 nmol / L. February 2009 and March during the observation period Sb (III) / Sb (III-V) the value of the basic remains the same, the higher concentration of Sb (V) inshore, decreased gradually with the increase in the offshore, showed significant terrestrial input. Two voyages concentration of Sb (V) Vertical distribution is basically the same, the overall performance is higher than the bottom surface, a slight change in the middle, basically the same concentration of Sb (III) Vertical distribution of points, higher surface concentration, level of the underlying minimum, which may be related to the adequacy and the surface light. The existing experimental evidence that the content and distribution of the Yellow Sea Sb (III) and Sb (III, V) by the mixing of water masses and terrestrial input significant impact, no significant effects of the activity of phytoplankton and suspended particulate matter content of antimony and antimony form.

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