The chemical characteristic of the groundwater in Xingren basin of Ningxia was studied.

对宁夏西部兴仁盆地地下水水化学特征进行了研究。

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Identification of Fritillaria and establishment of the chemical characteristic fingerprinting can used the methods.

该种方法可用于贝母的鉴别，并有助于贝母化学特征指纹图谱的建立。

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RESULT Those parameters and information values reflected the isolation quality of the chemical characteristic fingerprint of Fagopyrum tatarium Gaertn.

结果这些指标参数及信息量值都能较好的反映不同检测条件下苦荞麦化学特征指纹图谱的分离质量。

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Soil samples can be taken in which you can look for either residue of a chemical agent or the product's characteristic of when an agent degrades.

BBC: Syria chemical weapons claims: UK and US tread cautiously

They would collect environmental samples such as soil, rubble or vegetation that may have been in contact with the chemical warfare agent and may still contain characteristic degradation products or even traces of it.

BBC: How to investigate chemical weapons allegations

The Anthropocene's equivalent of iridium is nitrogen - although there will be other candidates (such as heavy metals, and carbon isotope ratios characteristic of fossil fuel emissions) for geochemists of the far future to identify as the chemical signature of the new epoch's dawn.

BBC: Leaving our mark: Fossils of the future