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。
Target analytes can be sampled from trace to neat concentrations using the CUSDT SPME syringe.
CUSDT固相微萃取管可以从痕量或微量浓度把目标分析物提取出来。
The results show that medium composition, trace element concentrations and fungi strains can affect the bioconcentrating action of edible fungi.
结果显示：培养基成分、微量元素浓度和食用菌菌株会影响食用菌的生物富集作用。
In addition, 3 whole nodule samples selected from the same station were measured for concentrations of the major and trace elements.
另外，从相同站位上又选择了3个结核进行了全结核的常量和微量元素浓度测定。
Atomic absorption spectroscopy has proved to be a versatile tool in measuring concentrations of trace metals.
原子吸收光谱法已证明是一种用于测定痕量的金属浓度的灵活多用的仪器。
In this paper, it reviewed a few commonly used sample pre-treatment methods and detection methods in monitoring of trace organic pollutants concentrations in water environment for the current.
本文主要针对目前监测环境水体中痕量有机污染物浓度常使用的一些样品前处理方法和检测方法进行综述。
Atomic absorption spectroscopy has proved to be a versatile tool in measuring concentrations of trace metals.
法已证明是一种用于测定痕量的金属浓度的灵活多用的仪器。
It's a high selectivity, high sensitivity, high stability way that use photo acoustic method to detect trace gas concentrations.
光声法检测痕迹气体浓度，是一种具有高选择性，高灵敏度，高稳定性的气体检测方法。
The elemental composition and concentrations of trace elements in seawater, suspended matters, and Marine rain are presented for samples collected at the Western Pacific Regions.
本工作测定了西太平洋海域中海水、海水悬浮物和海面上雨水的元素组成和浓度。
The results indicated that the concentrations of TSP, PM10 and trace metals were closely related to the functionality of the locality. Obvious temporal variation of the concentrations was observed.
研究结果表明，TSP和PM 10浓度及微量金属含量都与区域的功能性密切相关，并呈明显的季节变化。
Moreover, the processing of ores introduced poorly controlled changes in the concentrations of minor and trace elements in the resulting metal.
此外，对矿石的加工过程也在随之而形成的金属中引入了某些有失控制的次要和微量元素含量的变化。
Moreover, the processing of ores introduced poorly controlled changes in the concentrations of minor and trace elements in the resulting metal.
此外，对矿石的加工过程也在随之而形成的金属中引入了某些有失控制的次要和微量元素含量的变化。
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