Characterizing the Oxygen Isotopic Composition of Phosphate Sources to Aquatic Ecosystems
Characterizing the Oxygen Isotopic Composition of Phosphate Sources to Aquatic Ecosystems
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DOI：
10.1021/es900337q
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发表时间：
2009-07-15
影响因子：
11.4
通讯作者：
Paytan, Adina
中科院分区：
文献类型：
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作者：
Young, Megan B.;McLaughlin, Karen;Paytan, Adina
在许多水生生态系统中，溶解无机磷酸盐（δ O-18(p)）的氧同位素组成与环境水不处于同位素平衡，因此可能反映源δ O-18(p)。确定水体的磷酸盐来源对于设计减少磷酸盐负荷以控制富营养化的最佳管理实践至关重要。为了使δ O-18(p)成为一种有用的来源跟踪工具，磷酸源的δ O-18(p)必须能够彼此区分；然而，潜在源的δ O-18(p)尚未得到很好的表征。我们测量了各种已知磷酸盐来源的δ O-18(p)，包括肥料、半加工磷矿石、颗粒气溶胶、洗涤剂、植被、土壤、动物粪便和废水处理厂流出物的渗滤液。我们发现各种来源的δ O-18(p)值范围相当大（从+8.4到+24.9千分之一），并且在几种来源类型之间发现了统计学上显著的差异。在三种不同的淡水系统中测量的δ O-18(p)通常与周围水不平衡。尽管不同样品组之间的δ O-18(p)值存在重叠，但我们的研究结果表明，某些来源在同位素上是不同的，δ O-18(p)可以用于鉴定水体系统中的磷酸盐。
The oxygen isotopic composition of dissolved inorganic phosphate (delta O-18(p)) in many aquatic ecosystems is not in isotopic equilibrium with ambient water and, therefore, may reflect the source delta O-18(p). Identification of phosphate sources to water bodies is critical for designing best management practices for phosphate load reduction to control eutrophication. In order for delta O-18(p) to be a useful tool for source tracking, the delta O-18(p) of phosphate sources must be distinguishable from one another; however, the delta O-18(p) of potential sources has not been well characterized. We measured the delta O-18(p) of a variety of known phosphate sources, including fertilizers, semiprocessed phosphorite ore, particulate aerosols, detergents, leachates of vegetation, soil, animal feces, and wastewater treatment plant effluent We found a considerable range of delta O-18(p) values (from +8.4 to +24.9 parts per thousand) for the various sources, and statistically significant differences were found between several of the source types. delta O-18(p) measured in three different fresh water systems was generally not in equilibrium with ambient water. Although there is overlap in delta O-18(p) values among the groups of samples, our results indicate that some sources are isotopically distinct and delta O-18(p) can be used for identifying phosphate to aquatic systems.