trace element concentrations 微量元素含量
Photoacoustic detection of trace concentrations of gases is one of the most sensitive techniques of infrared Absorption spectroscopy.
光声光谱法是基于红外吸收光谱原理的一种高灵敏度的微量气体探测技术。
A highly sensitive chromatographic system is desirable particularly for monitoring analyte present in trace concentrations within samples.
高灵敏的层析系统是一个理想的系统，特别对监测存在于样本追踪浓度的分析物。
They also require trace amounts of iron which limits phytoplankton growth in large areas of the ocean because iron concentrations are very low.
它们还需要微量的铁，由于海洋中铁的含量非常低，限制了浮游植物大面积的生长。
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