Carbon and Nitrogen Isotopic Signatures and Nitrogen Profile To Identify Adulteration in Organic Fertilizers
详细信息 查看全文
- 作者：Sergei Verenitch ; Asit Mazumder
- 刊名：Journal of Agricultural and Food Chemistry
- 出版年：2012
- 出版时间：August 29, 2012
- 年：2012
- 卷：60
- 期：34
- 页码：8278-8285
- 全文大小：230K
- 年卷期：v.60,no.34(August 29, 2012)
- ISSN：1520-5118
文摘
Recently it has been shown that stable isotopes of nitrogen can be used to discriminate between organic and synthetic fertilizers, but the robustness of the approach is questionable. This work developed a comprehensive method that is far more robust in identifying an adulteration of organic nitrogen fertilizers. Organic fertilizers of various types (manures, composts, blood meal, bone meal, fish meal, products of poultry and plant productions, molasses and seaweed based, and others) available on the North American market were analyzed to reveal the most sensitive criteria as well as their quantitative ranges, which can be used in their authentication. Organic nitrogen fertilizers of known origins with a wide 未15N range between 鈭?.55 and 28.85鈥?(n = 1258) were characterized for C and N content, 未13C, 未15N, viscosity, pH, and nitrogen profile (urea, ammonia, organic N, water insoluble N, and NO3). A statistically significant data set of characterized unique organic nitrogen fertilizers (n = 335) of various known origins has been assembled. Deliberately adulterated samples of different types of organic fertilizers mixed with synthetic fertilizers at a wide range of proportions have been used to develop the quantitative critical characteristics of organic fertilizers as the key indicators of their adulteration. Statistical analysis based on the discriminant functions of the quantitative critical characteristics of organic nitrogen fertilizers from 14 different source materials revealed a very high average rate of correct classification. The developed methodology has been successfully used as a source identification tool for numerous commercial nitrogen fertilizers available on the North American market.