Dissolved and labile particulate Zr, Hf, Nb, Ta, Mo and W in the western North Pacific Ocean
Dissolved and labile particulate Zr, Hf, Nb, Ta, Mo and W in the western North Pacific Ocean
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DOI：
10.1007/s10872-008-0019-z
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发表时间：
2008-04
影响因子：
2.3
通讯作者：
M. Lutfi Firdaus;K. Norisuye;Y. Nakagawa;S. Nakatsuka;Y. Sohrin
中科院分区：
文献类型：
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作者：
M. Lutfi Firdaus;K. Norisuye;Y. Nakagawa;S. Nakatsuka;Y. Sohrin
在西北太平洋K1站(51°N，165°E)、K2站(47°N，160°E)、纽结站(44°N，155°E)和35N站(35°N，160°E)测定了溶解和不稳定颗粒物Zr、Hf、Nb、Ta、Mo和W。溶解物种(D)的一部分海水通过0.2微米核孔过滤器，并用盐酸和氢氟酸酸化至pH 2.2。部分海水中的酸可溶物质(AD)在没有过滤的情况下被酸化。不稳定颗粒物(LP)的定义是AD减去D，它代表化学上不稳定的颗粒物物种的一部分。D-Zr、Hf和Ta随深度增加，Nb略有亏损，而Mo和W具有保守的垂向剖面。钼的浓度范围为97~105nmokg·−~(-1)。在4000m以下，Zr、Hf、Ta的Lp平均占AD的10~14%，最高可增加25%，而Mo和W的Lp可忽略不计。相比之下，Lp-Nb在地表水中显示最大值(高达27%)。我们还发现，D-Zr/Hf、Nb/Ta和Mo/W摩尔比一般按陆壳-河水-近海-开阔洋的顺序增加。
Dissolved and labile particulate Zr, Hf, Nb, Ta, Mo and W were determined at stations K1 (51°N, 165°E), K2 (47°N, 160°E), KNOT (44°N, 155°E) and 35N (35°N, 160°E) in the western North Pacific Ocean. A portion of seawater for dissolved species (D) was passed through a 0.2µm Nuclepore filter and acidified to pH 2.2 with HCl and HF. A portion of seawater for acid-dissolvable species (AD) was acidified without filtration. Labile particulate (LP) species is defined as AD minus D, which represents a chemically labile fraction of particulate species. D-Zr, Hf and Ta increase with depth, Nb shows a slight depletion in surface water, whereas Mo and W have a conservative vertical profile. The concentration range of D-Zr, Hf, Nb, Ta and W is 31–275, 0.14–0.95, 4.0–7.2, 0.08–0.29 and 40–51 pmol kg−1, respectively, whereas that of Mo is 97–105 nmol kg−1. LP-species of Zr, Hf and Ta account for 10–14% of AD in average and increase up to 25% below 4000 m, whereas those for Mo and W are negligible. In contrast, LP-Nb shows maxima (up to 27%) in surface water. We also found that D-Zr/Hf, Nb/Ta and Mo/W mole ratios generally increase in the order continental crust < river water < coastal sea < open ocean.