How Rugged Are Our Nitrogen Methods?
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Abstract Youden’s ruggedness test was made of two official methods and four more recent methods for the determination of total nitrogen in fertilizers containing nitrates. Among the variables tested were amounts of nitrogen and reductant, effect of chloride, and time of reaction of reductant. Official method 2.039 (reduced-iron) failed the test. In order of increasing standard deviation, the five methods that passed the test were the chromous reduction method, Raney-catalyst-powder method, official method 2.037 (salicylic acid), improved reduced-iron method, and the chromiumpowder method.
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2008 ◽
Vol 91
(4)
◽
pp. 777-785
◽
2007 ◽
Vol 90
(1)
◽
pp. 187-195
◽
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