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Application of Mixed-Level Orthogonal Design in Determination of Heavy Metals in Soil, for Example Pb

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Abstract:

In order to precisely determinate absorbance of all kinds of heavy metals in soil,7- important factors were optimized by mixed-level orthogonal design.For example Pb,discuss the factors influence degree on digestion and determination of Pb.Pb-absorbance trends within the area is expressed by the change of two-dimensional planar contour.Pb-absorbance distribution was drawn by 3D visualization technology.In order to optimize the orthogonal design,taking the optimal value of decentralized points in orthogonal test convert into taking the optimal value on a continuous plane. Using Minitab16 software analyzed the experimental results.The results showed that affecting Pb digestion Primary and secondary order is B(HF)> C(HNO3)> A(HClO4)> I(Acetylene flow rate)>D(HCL)>G (Assistant combustion gas)>H(Lamp current)>F(Burner height),that was adding 9 mlHNO3, 3mLHF, 3 mlHClO4 in soil samples, after microwave digestion, got the optimal Pb-absorbance value 0.304 under the the working conditions of atomic absorption spectrophotometer for Pb 217.0nm, slit width 1.3nm, burner height 4nm, assistant combustion gas 2.4 L/min, the lamp current 4.0mA, propane flow rate 4.0 L/min.

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Periodical:

Applied Mechanics and Materials (Volumes 522-524)

Pages:

7-11

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.522-524.7

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Online since:

February 2014

Authors:

Xi Cheng Xue*, Gang Liu

Keywords:

3D Visualization Technology, Heavy Metal, Mixed-Level Orthogonal Design, Pb

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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References

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