Determination of Alkali-hydrolyzable Nitrogen in Soil by Titration with a Sealed Plastic Box
Received:February 28, 2017  Revised:May 26, 2017
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DOI:doi:10.3969/j.issn.2095-1035.2017.03.009
KeyWord:soil; alkali-hydrolyzable nitrogen; internal and external separation; plastic sealed box
                 
AuthorInstitution
SHI Chang 河北省地矿中心实验室,河北 保定
WAN Qiuyue 河北省地矿中心实验室,河北 保定
QIN Chong 河北省地矿中心实验室,河北 保定
LIU Aiqin 河北省地矿中心实验室,河北 保定
ZHANG Shuo 河北省地矿中心实验室,河北 保定
AN Caixiu 河北省地矿中心实验室,河北 保定
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Abstract:
      In this paper, an alkaline hydrolysis-diffusion method was used to determine alkaline-hydrolysis nitrogen in soil. A sealed plastic box with a quartz container was used for alkaline-hydrolysis nitrogen diffusion absorption, instead of traditional glass diffusion boat. The stability of soil standard samples in seven different areas for 100 consecutive days was examined. The standard deviation of the results was between 0.707 mg/kg and 2.825 mg/kg. The precision tests showed that the relative standard deviation was between 0.36% and 0.67%. It was found that results of this hydrolysis-diffusion method were consistent with the traditional method for 30 samples. The proposed scheme has realized inside and outside separation of the chamber, simplification of analysis; and accurate and reliable results. The method is especially suitable for routine analysis.
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