Organic carbon and nitrogen concentrations on vertical profiles in waters of ...

Not filtered water samples were taken in 10 ml ampoules (sealed immediately after being acidified with phosphoric acid to pH<2, sampling), or 40 ml screw-lid vials, and...未经过滤的水样采集于10毫升安瓿瓶（采样后立即用磷酸酸化至pH值小于2并密封）或40毫升螺口样品瓶，且……