Experiments focusing on the effects of high carbon content of collected dust samples of magnesium, aluminum, potassium, calcium, chromium, manganese, copper, barium, lead, cadmium, zinc and other elements determination, and solves the problem of carbon removal. Samples using high temperature muffle furnace in addition to carbon, the use of hydrochloric acid - nitric acid - hydrofluoric acid - perchloric acid digestion sample ash, chose magnesium, aluminum, potassium, calcium, chromium, manganese, copper, barium, lead, cadmium, zinc and other elements analytical lines and buckle background mode, the establishment of an inductively coupled plasma atomic emission spectrometry (ICP-AES) Determination of high carbon gray dust of magnesium, aluminum, potassium, calcium, chromium, manganese, copper, barium, lead, cadmium the process of zinc and other elements. Under optimum working conditions, the calibration curve for each element of the linear correlation coefficient r greater than 0.999 5, the method detection limits between 1.08 ~ 26.01mg / kg. The method used in removal of magnesium, aluminum, potassium, calcium, chromium, manganese, copper, barium, lead, cadmium, zinc ash determination in real samples, relative standard deviation (RSD, n = 11) 0.90% 7.1% the recoveries of the target element from 90% to 117%; measured according to test method collected dust in magnesium, aluminum, potassium, calcium, zinc, results were consistent with flame atomic absorption spectrometry (FAAS) coincide.

Rare earth element content is low, the substrate and polyatomic ions serious is difficulty to make the determination of rare earth elements in rocks and stream sediments. Nitric acid - hydrochloric acid - hydrofluoric acid - perchloric acid mixed system to dissolve the sample.