Temporal variability of trace metals in new jersey pinelands streams: relationships to discharge and pH
Temporal variability of trace metals in new jersey pinelands streams: relationships to discharge and pH
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新泽西州松林溪流中微量金属的时间变化：与流量和 pH 值的关系
DOI：
10.1016/s0016-7037(99)00254-9
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发表时间：
1999
影响因子：
5
通讯作者：
J. Ross
中科院分区：
文献类型：
--
作者：
R. Sherrell;J. Ross
溶解和颗粒的微量金属（铝，镉，铜，铅，锌）的浓度测定超过21个月的时间内在四个流水网站在Pinelands（新泽西，美国），沿海平原地区的特点是低pH值的沃茨和高度风化的土壤。铝和锌也确定在两个网站超过5天的时间内，一个主要的降水事件。在Batsto河（pH值4.4-6.3），一个代表性的Pinelands流排水主要是森林流域适度影响农业，排放加权平均浓度的溶解金属（nM）：铝= 4610;镉= 0.39;铜= 4.6;铅= 1.0;和锌= 149。未开发的巴斯河（pH 4.1-4.8）中溶解的Cd、Cu和Zn在类似的范围内，但Pb浓度高2-3倍。溶解金属显示出高度显着的正相关性，放电，和较弱的逆关系，pH值的长期和短期的时间序列。总的来说，溶解金属浓度的季节性和短期变化是最一致的控制水文流动路径的变化，在高排放，当浅地下水动员人为金属存储在近地表土壤层和旁路潜在的金属去除过程中接壤的湿地。数据还表明，在流金属去除驱动的夏季生物生产力可能会进一步降低低排放金属浓度，作为一个次要的影响。对于这些金属，颗粒分数一般是次要的，在溶液/颗粒分区的变化是不重要的空间/时间变化溶解浓度，除了铅。大气输入的估计可以解释这些金属的河流通量，并建议锌保留在这个系统中是最小的，而铅，铜和镉更强烈地保留。排放量和金属浓度之间的正相关关系，以及与世界其他河流相比，Pinelands流中异常高的浓度，表明河流对河口和附近沿海海洋金属分布的影响将是可测量的，并且具有很强的季节性。
Dissolved and particulate trace metal (Al, Cd, Cu, Pb, and Zn) concentrations were determined over a 21 month time period at four streamwater sites in the Pinelands (New Jersey, USA), a coastal plain region characterized by low-pH waters and highly weathered soils. Al and Zn were also determined at two sites over a 5 day period following a major precipitation event. In the Batsto River (pH 4.4–6.3), a representative Pinelands stream draining a largely forested watershed moderately impacted by agriculture, discharge-weighted mean concentrations of dissolved metals were (in nM): Al = 4610; Cd = 0.39; Cu = 4.6; Pb = 1.0; and Zn = 149. Dissolved Cd, Cu, and Zn in the undeveloped Bass River (pH 4.1–4.8) are in a similar range, but Pb concentration is 2–3 times greater. Dissolved metals show highly significant positive correlations to discharge, and weaker inverse relationships to pH over both the long- and short-term time series. Overall, seasonal and short-term variability in dissolved metal concentrations is most consistent with control by hydrologic flow path changes during high discharge, when shallow groundwaters mobilize anthropogenic metals stored in near-surface soil horizons and bypass potential metal removal processes in bordering wetlands. The data also suggest that in-stream metal removal driven by summertime biological productivity may further reduce low-discharge metal concentrations, as a secondary effect. For these metals, the particulate fraction is generally minor, and variations in solution/particle partitioning are unimportant to spatial/temporal variations dissolved concentrations, except for Pb. Estimates of atmospheric input can account for riverine fluxes of these metals, and suggest that Zn retention is minimal in this system, while Pb, Cu and Cd are more strongly retained. The positive relationship between discharge and metals concentration, and the unusually high concentrations in Pinelands streams compared to other world rivers, suggest that riverine effects on metals distributions in the estuary and nearby coastal ocean will be measurable and strongly seasonal.
影响因子：
11.4
作者：
Chillrud, SN;Bopp, RF;Yarme, A
通讯作者：
Yarme, A