This standard specifies the method for the determination of 34 elements such as lead, cadmium, vanadium, and phosphorus in natural waters and sediments by inductively coupled plasma emission spectrometry. The 34 elements are listed in Table 1. The detection limit is about 0.2 ~ 20.0 μg/L. The recommended wavelength, reference detection limit and linear related parameters are shown in Table B. All samples should be dissolved in a liquid state when analyzed.