The results indicate that the content of carbon is about 90%, the degree of graphitization is 66% and the carbon of simple substance phase at the surface is 54%.

结果表明纳米石墨中碳含量为90%左右，石墨化度为66%，表面碳原子以碳单质状态存在的占54%。

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Surface soil samples were collected in the deserts and Gobi regions of China. The carbonate content and carbon and oxygen isotopic composition were analyzed.

在中国的主要沙漠和戈壁等粉尘源区采集了地表沙或土壤（统称为表土）样品，分析了样品的碳酸盐含量和碳酸盐的碳氧同位素组成。

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GDS testing results indicate the carbon content of the surface reaches 29.8%, the carbon content in the alloyed layer emerges in gradient distribution too.

辉光放电光电子谱仪（GDS）渗层成分检测结果表明表面含碳量可达29.8%，合金渗层的碳含量也呈梯度分布；

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