Determination of total sulfur in soil by inductively coupled plasma spectrometry
Sulfur is an important medium element in plants.It is the fourth major nutrient after nitrogen,phosphorus and potassium,and is one of the indispensable elements for the growth and development of all plants.Sulfur plays an important role in plant growth,development and metabolism.The total sulfur in soil can reflect the ecological and environmental effects of soil sulfur,so the detection of total sulfur in soil is very important.The soil sample was digested with nitric acid-hydrogen peroxide as the acid digestion system,different forms of sulfur in the soil was converted into soluble inorganic sulfur.The content of sulfur in soil was determined by inductively coupled plasma emission spectrometer.0.25 g of soil sample was added to 10 mL of nitric acid and 5 mL of hydrogen peroxide,the sample was digested on a 150 ℃ electric heating plate,and was taken down at the remaining volume of about 2 mL.After the sample was cooled to room temperature,the volume was fixed to 25 mL,and determined the sulfur content by inductively coupled plasma spectrometer.The test results showed that when the spectral analysis line was 182.037 nm,it had the advantages of good sensitivity and less interference.A linear regression curve was established with the sulfur content of the sample as the abscissa and the strength as the ordinate.The linear regression curve was Y=0.001195C+0.037420,and the linear correlation coefficient R2 was 0.9999.Under the optimized conditions,the detection limit and quantitative limit of the method were 7 and 23 mg/kg,respectively.In order to verify the precision of the method,the national standard materials of different content levels were selected for parallel determination for six times,and the results showed that the relative standard deviation was 2.2％-6.8％.The absolute deviation was 2-171 mg/kg,all test results met the recommended values of national standard materials.
total sulfursoilinductively coupled plasma emission spectroscopydetermination
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