Isotope dilution method was adopted in lab for the study of the effect of crude oil contamination on the rate of nitrogen mineralization and nitrification in soil.

在实验室中用同位素示踪法，研究了土壤中不同石油污染量对氮矿化及硝化速率的影响。

youdao

Hers is not the lab that did the tests on Floyd Landis, but Dr. Ayotte has used the carbon isotope test since the late 1990s.

NPR: Landis Facing Uphill Battle on Doping Charges