| 光谱学与光谱分析 |
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| Determination of Trace Elements in the Melon of Indo-Pacific Humpback Dolphins (Sousa chinensis) with ICP-MS |
| ZHANG Ling-li1, 2, DING Yu-long1, 3, ZHANG Mei1, 3, GUI Duan1, 3, NING Xi2, 3, LI Jun1, 3, WU Yu-ping1, 3* |
1. South China Sea Bio-Resource Exploitation and Utilization Collaborative Innovation Center, Sun Yat-sen University, Guangzhou 510275, China
2. School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China
3. School of Marine Sciences, Sun Yat-sen University, Zhuhai 519082, China |
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Abstract The Indo-Pacific humpback dolphins (Sousa chinensis) with long life-span are top predators in marine ecosystem -and they could accumulate heavy metals and persistent organic pollutants in their tissues, while the melon is a unique lipid-rich structure within the cetacean forehead that functions in the transmission of echolocation signals. To explore the baseline levels and the main characteristics of the components, the concentrations of vanadium (V), nickel (Ni), chromium (Cr), manganese (Mn), copper (Cu), arsenic (As), zinc (Zn), mercury (Hg), selenium (Se), cadmium (Cd) and lead (Pb) were determined in the melon of the Indo-Pacific humpback dolphins with inductively coupled plasma mass spectrometry (ICP-MS). The results showed that this method was quite suitable for the determination of trace elements in the melon of Indo-Pacific humpback dolphins with highly accuracy and precision, and the trace elements in melon existed individual differences. The average contents were in the order of Zn>As>Cu>Mn>Se>Hg>Cr>Ni>V>Pb>Cd. It is worth noting that the within (1.158 μg·g-1 ww), non-essential toxic trace element may cause toxic effect on the dolphins. Spearman correlation analysis showed positively significant correlations between As, Cd, Hg and body length, indicating that the concentrations of As, Cd, Hg may increase with age. Moreover, Cr and Ni were positively correlated (p<0.05), a significant negative correlation was observed between Mn and As (p<0.01), indicating that there are certain correlation among elements. In addition, the principal component analysis results showed that V, Mn, Ni, Se, Cu, Hg are the main characteristics of trace elements for melon. This study presents a reliable method for determination of the trace element analysis in cetacean melon, and this is the first study that reports the trance elements in the melon of the Indo-Pacific humpback dolphins in PRE that could provide reasonable and effective information for its conservation work.
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Received: 2015-06-27
Accepted: 2015-10-20
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Corresponding Authors:
WU Yu-ping
E-mail: exwyp@163.com
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