Phosphorus compounds in the dissolved and particulate phases in urban rivers and a downstream eutrophic lake as analyzed using 31P NMR.
Phosphorus compounds in the dissolved and particulate phases in urban rivers and a downstream eutrophic lake as analyzed using 31P NMR.
复制标题
使用 31P NMR 分析城市河流和下游富营养化湖泊中溶解相和颗粒相中的磷化合物。
DOI：
10.1016/j.envpol.2021.117732
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发表时间：
2021
影响因子：
8.9
通讯作者：
Kimura K.
中科院分区：
文献类型：
--
作者：
Hafuka A.;Tsubokawa Y.;Shinohara R.;Kimura K.
人类活动对磷的排放导致湖泊富营养化。我们调查了流经日本札幌市区的高污水负荷河流中磷（P）的形态，当其向下游输送到富营养化湖泊巴拉托湖时是否发生了转化。我们推测，无机磷提供的河流可能会转化为有机形态的湖泊。结果表明，入湖河流中溶解性活性磷（SRP）和颗粒态无机磷（PIP）占主导地位。河流中的悬浮物富含铁（Fe），因此PIP与Fe相关。河口和下游4.5km处的浓度比较表明，SRP和PIP的浓度在下游4.5km处低于河口，而有机P（即，溶解有机磷和颗粒有机磷）相似。湖水solution 31 P核磁共振谱分析结果表明，焦磷酸盐仅存在于颗粒组分中，而正磷酸二酯（DNA-P）仅存在于溶解组分中。河流样品中含有正磷酸盐（ortho-P），而湖泊样品中含有ortho-P，正磷酸单酯，和DNA-P。结果表明，P的形式，特别是那些溶解的P，从无机转移到有机形式的水从河流排放到湖泊。
Phosphorus (P) discharges from human activities result in eutrophication of lakes. We investigated whether the forms of phosphorus (P) in rivers with high effluent loads flowing through urban areas of Sapporo, Japan, were transformed when transported downstream into a eutrophic lake, namely Lake Barato. We hypothesized that the inorganic P supplied from the rivers might be transformed to organic forms in the lake. The results showed that soluble reactive phosphorus (SRP) and particulate inorganic phosphorus (PIP) dominated in the river discharge to the lake. Suspended solids in the rivers were rich in iron (Fe) so PIP was associated with Fe. A comparison of the concentrations at the river mouth and 4.5 km downstream showed that the concentrations of SRP and PIP were lower at 4.5 km downstream than at the river mouth, whereas the concentrations of organic P (i.e., dissolved organic phosphorus and particulate organic phosphorus) were similar. The results from solution31P nuclear magnetic resonance spectroscopy of lake water showed that pyrophosphate was only present in the particulate fraction, while orthophosphate diesters (DNA-P) were only present in the dissolved fraction. Riverine samples contained orthophosphate (ortho-P) only, while lake samples contained ortho-P, orthophosphate monoesters, and DNA-P. The results suggest that the P forms, particularly those of dissolved P, shifted from inorganic to organic forms as the water was discharged from the river to the lake.