The presence of trace phosphine in Lake Taihu water
The presence of trace phosphine in Lake Taihu water
复制标题
太湖水中存在微量磷化氢
DOI：
10.1080/03067310903013230
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发表时间：
2010-01-01
影响因子：
2.6
通讯作者：
Glindemann, Dietmar
中科院分区：
文献类型：
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作者：
Geng, Jinju;Niu, Xiaojun;Glindemann, Dietmar
磷化氢（PH3）是磷(P)化学循环中的天然成分。磷化氢的发现将为磷补充和生物地球化学循环机制的研究提供新的思路。由于磷化氢经过次磷酸盐和亚磷酸盐的复合氧化转化为磷酸盐，如果它存在于水柱中，了解它的产生和排放可以增强我们对磷形态的理解。假设气相磷化氢为理想气体，且在水气界面平衡时，可以用亨利定律从气相平衡浓度定量计算水溶液中的磷化氢。将该方法应用于中国太湖，分析了未过滤和过滤水样（0.45 μm）中的磷化氢。结果表明，太湖水体中普遍存在磷化氢。未经过滤的水中磷化氢浓度范围为0.16至1.11 pg L−1，过滤后的样品中磷化氢浓度要低得多（0.01至0.04 pg L−1）。90%以上的磷化氢被吸附或并入水中溶解率<10%的悬浮物中。温暖季节磷化氢浓度较高。PH3与TP（平均r2 = 0.59±0.22）、TSP（平均r2 = 0.37±0.13）呈正相关。
Phosphine (PH3) is a natural constituent in phosphorus (P) chemical cycles. The discovery of phosphine will shed new light on the mechanisms of P supplement and biogeochemical cycles. Since phosphine is converted to phosphate after complex oxidation via hypophosphite and phosphite, if it were present in the water column, understanding its production and emission could enhance our understanding of P speciation. Assuming that phosphine in the gas phase is an ideal gas and at equilibrium between water and gas interface, phosphine in water solution can be quantified from the equilibrated concentration in gas phase using the Henry's Law. Application of this approach to Lake Taihu, China, phosphine in unfiltered and filtered water samples (0.45 μm) was analysed. Results showed that phosphine was universally present in Lake Taihu water. Phosphine concentration in unfiltered water ranged from 0.16 to 1.11 pg L−1, and was much less (0.01 to 0.04 pg L−1) in filtered samples. Over 90% of phosphine was adsorbed onto or incorporated into suspended materials with <10% dissolved in the water. Higher phosphine concentrations could be observed in warm seasons. Positive relationships were found between PH3 and TP (average R 2 = 0.59 ± 0.22) and TSP (average R 2 = 0.37 ± 0.13).