Topic
Sulfamic acid
About: Sulfamic acid is a research topic. Over the lifetime, 1700 publications have been published within this topic receiving 16621 citations. The topic is also known as: Sulfamic acid & Amidosulfuric acid.
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TL;DR: In this article, steam distillation methods of determining ammonium, nitrate, and nitrite in the presence of alkali-labile organic nitrogen compounds are described, which are used for tracer studies using 15N-enriched compounds.
993 citations
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TL;DR: In this paper, a procedure has been developed which enables uranium to be determined without chemical separation in solutions containing iron, plutonium, nitrate and many other foreign ions, which interfere in conventional redox methods.
377 citations
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TL;DR: Sulfamic acid addition is applied to analyses of the coupled N and O isotopes of nitrate and nitrite in waters of the Mexican Margin, to illustrate its efficacy and utility when employed either in the field upon sample collection or in the lab after months of frozen sample storage.
Abstract: In environmental water samples that contain both nitrate (NO) and nitrite (NO), isotopic analysis of nitrate alone by all currently available methods requires pretreatment to remove nitrite. Sulfamic acid addition, used previously for this purpose (Wu JP, Calvert SE, Wong CS. Deep-SeaResearchPartI–OceanographicResearchPapers 1997; 44: 287), is shown here to be compatible with the denitrifier method for both N and O isotope analysis of nitrate. Sulfamic acid at a pH of ∼1.7 reduces nitrite to N2. Samples are then neutralized with base prior to isotope analysis, to alleviate the buffering demands of the bacterial media and as a precaution to prevent modification of nitrate during storage with the residual sulfamic acid at low pH. Under appropriate reaction conditions, nitrite is completely removed within minutes. Sulfamic acid treatment does not compromise the completeness of the conversion of nitrate into N2O or the precision and accuracy of N and O isotope measurements by the denitrifier method. Nitrite concentrations upwards of 7 times the ambient nitrate can be removed without affecting the isotope composition of nitrate. The method is applied to analyses of the coupled N and O isotopes of nitrate and nitrite in waters of the Mexican Margin, to illustrate its efficacy and utility when employed either in the field upon sample collection or in the lab after months of frozen sample storage. Copyright © 2009 John Wiley & Sons, Ltd.
275 citations