A new chemical analyzer for in situ measurement of nitrate and total sulfide over hydrothermal vent biological communities
A new chemical analyzer for in situ measurement of nitrate and total sulfide over hydrothermal vent biological communities
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用于原位测量热液喷口生物群落硝酸盐和总硫化物的新型化学分析仪
DOI：
10.1016/s0304-4203(00)00057-8
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发表时间：
2000
期刊：
影响因子：
3
通讯作者：
A. Alayse
中科院分区：
文献类型：
--
作者：
N. Bris;P. Sarradin;D. Birot;A. Alayse
基于比色检测和流动注射分析（FIA），设计了一种新型潜水化学分析仪ALCHIMIST (AnaLyseur CHIMique In SiTu)，用于深海热液环境中硝酸盐+亚硝酸盐（N+N）和总溶解硫化物（∑S）的原位测量。在原位试验之前，在模拟条件下（1-300×105Pa, 5-25°C）检查了静水压力和温度对分析响应的影响。首次试验是在远程操作车辆（ROV） VICTOR 6000在Lucky Strike热液喷口区（大西洋中脊）进行的。安装在ROV上的ALCHIMIST可以在1650米深度同时进行N+N和∑S校准和测量，每小时分析22次。在深部，原位∑S和N+N测量的精度分别为1.1%和0.8%。∑S检测限为0.8 μM， N+N检测限为0.5 μM。在Lucky Strike地区的一个通风口，ALCHIMIST能够在分米尺度上解析出表征热液动物群斑块分布的化学梯度。此外，温度-浓度关系提供了控制栖息地化学过程的进一步信息。与现有的原位分析仪一样，该仪器对表征喷口动物环境的物理化学特征具有重要价值。
A new submersible chemical analyzer, ALCHIMIST (AnaLyseur CHIMique In SiTu), based on colorimetric detection and flow injection analysis (FIA), was adapted to allow in situ measurements of nitrate+nitrite (N+N) and total dissolved sulfide (∑S) in the deep sea hydrothermal environment. Before in situ trials, the influence of hydrostatic pressure and temperature on the analytical responses was examined under simulated conditions (1–300×105Pa, 5–25°C). First trials were performed during dives of the Remotely Operated Vehicle (ROV), VICTOR 6000, over the Lucky Strike hydrothermal vent field (Mid-Atlantic Ridge). ALCHIMIST, installed on the ROV, enabled simultaneous N+N and ∑S calibration and measurements at 1650 m depth, at a rate of 22 analyses per hour. At depth, the precision of the in situ ∑S and N+N measurements is estimated to be, respectively, 1.1% and 0.8%. The detection limit is 0.8 μM for ∑S and 0.5 μM for N+N. At a vent site of the Lucky Strike area, ALCHIMIST enabled to resolve, at the decimeter scale, the chemical gradients which characterize the patchy distribution of hydrothermal fauna. Additionally, temperature–concentration relationships offered further information on the processes controlling the chemistry of the habitats. Like former in situ analyzers used in this field, this new instrument should be valuable to characterize the physico-chemical characteristics of vent fauna environment.