| Assessment of the conventional molybdenum-blue and magnesium-induced coprecipitation procedures in phosphorus measurement in various aquatic environments |
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| 作者姓名： | LIU Sumei ZHAO Yingfei REN Jingling ZHANG Jing SUN San JIN Jie ZHANG Guiling |
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| 作者单位： | LIU Sumei,ZHAO Yingfei,REN Jingling,SUN San,JIN Jie,ZHANG Guiling(Key Laboratory of Marine Chemistry Theory and Technology Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of Qingdao, Qingdao 266100, China);ZHANG Jing(State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China;Key Laboratory of Marine Chemistry Theory and Technology Ministry of Education, College of) |
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| 基金项目： | The National Natural Science Foundation of China under contract Nos 40876054 and 40925017;;the Science and Technology Key Program of the Ministry of Education under contract Nos NCET-05-0593 and 108081;;the Special Funds from National Key Basic Research Program under contract Nos 2006CB400602 and 2007DFB20380 |
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| 摘 要： | Phosphorus (P) is an essential nutrient utilized by all organisms for energy transport and growth.
Both the conventional molybdenum-blue method and the magnesium-induced coprecipitation
(MAGIC) procedures were applied for the measurement of dissolved inorganic phosphorus (DIP)
and total dissolved phosphorus (TDP) in more than 840 water samples collected between 2003 and
2005, including seawater (the Huanghai Sea, the East China Sea, and the northern South China
Sea), water from rivers and estuaries (the Changjiang, the Huanghe, and the major rivers emptying
into the Jiaozhou Bay), groundwater (in the drainage basin surrounding the Jiaozhou Bay), rain-
water, and aquaculture water samples. The MAGIC method allows the investigation of phosphorus
distributions and cycling for systems in which DIP is below the detection limits of conventional
methods. Comparison between the two methods demonstrated that the concentrations obtained
with both methods were signiˉcantly correlated. The di?erences of DIP and TDP concentrations
measured with the two methods were higher when the concentrations of DIP and TDP were lower,
implying the lower reproducibility at low concentrations. The concentration di?erences increase
with the increase in the proportion of DOP in TDP, which indicates that the discrepancy of DIP
concentrations measured with the two methods increases when the DOP concentration is high. The
discrepancies indicated that the composition of P compounds di?ers depending on sample sources
and water type; it would be useful to infer the presence of di?erent phosphorus compound pools
from di?erences between the two methods. This study indicates the potential presence of a pool
of alkaline-labile compounds for samples from rainwater and rivers and estuaries surrounding the
Jiaozhou Bay; the potential presence of acid-labile compounds that were adsorbed by Mg(OH)2 for
samples from the Changjiang Estuary, Huanghai Sea, East China Sea, and groundwater; the po-
tential presence of a substantial pool of acid-labile compounds that were not adsorbed by Mg(OH)2
for samples from the Huanghe Estuary, aquaculture water, the East China Sea algal bloom water,
and the northern South China Sea.
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| 关 键 词： | Mg（OH）2 溶解无机磷 稳定化合物 东中国海 南海北部 传统方法 低浓度 胶州湾 |
| 收稿时间： | 5/9/2008 12:00:00 AM |
| 修稿时间： | 2009/2/25 0:00:00 |
Assessment of the conventional molybdenum-blue and magnesium-induced coprecipitation procedures in phosphorus measurement in various aquatic environments |
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| LIU Sumei,ZHAO Yingfei,REN Jingling,ZHANG Jing,SUN San,JIN Jie,ZHANG Guiling.Assessment of the conventional molybdenum-blue and magnesium-induced coprecipitation procedures in phosphorus measurement in various aquatic environments[J].Acta Oceanologica Sinica,2010,29(1):42-51. |
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| Authors: | LIU Sumei ZHAO Yingfei REN Jingling ZHANG Jing SUN San JIN Jie and ZHANG Guiling |
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| Institution: | 1.Key Laboratory of Marine Chemistry Theory and Technology Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of Qingdao, Qingdao 266100, China2.Key Laboratory of Marine Chemistry Theory and Technology Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of Qingdao, Qingdao 266100, China;State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China |
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| Abstract: | Phosphorus(P) is an essential nutrient utilized by all organisms for energy transport and growth. Both the conventional molybdenum-blue method and the magnesium-induced coprecipitation(MAGIC) procedures were applied for the measurement of dissolved inorganic phosphorus(DIP) and total dissolved phosphorus(TDP) in more than 840 water samples collected between 2003 and 2005,including seawater(the Huanghai Sea,the East China Sea,and the northern South China Sea) ,water from rivers and estuaries(the Changjiang,t... |
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| Keywords: | phosphorus magnesium-induced coprecipitation conventional blue phosphomolybic acid assay various aquatic environments |
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