This HTML5 document contains 19 embedded RDF statements represented using HTML+Microdata notation.

The embedded RDF content will be recognized by any processor of HTML5 Microdata.

Subject Item

n2:w

rdf:type

rdac:C10001 bibo:Article

dcterms:isPartOf

n14:w

dcterms:subject

n8:article n13:environmentalmeasurementsmethods

dcterms:title

Precise and Accurate Compound Specific Carbon andNitrogen Isotope Analysis of Atrazine: Critical Role of CombustionOven Conditions

rdaw:P10072

n11:print n11:web

vivo:relatedBy

n7:4 n7:3 n7:1 n7:2

marcrel:aut

n2:meyerarminh n9:person n2:penningholger n2:lowagharald

dcterms:abstract

A Ni/NiO combustion interface accomplishes accurate andprecise carbon and nitrogen isotope analysis of atrazine by gas chromatography-isotoperatio mass spectrometry and allows determination of isotope fractionationduring alkaline hydrolysis. Compound-specific stable isotope analysis by gas chromatography-isotoperatio mass spectrometry (GC-IRMS) is increasingly used to assess originand fate of organic substances in the environment. Although analysiswithout isotopic discrimination is essential, it cannot be taken forgranted for new target compounds. We developed and validated carbonisotope analysis of atrazine, a herbicide widely used in agriculture.Combustion was tested with reactors containing (i) CuO/NiO/Pt operatingat 940 °C; (ii) CuO operating at 800 °C; (iii) Ni/NiO operatingat 1150 °C and being reoxidized for 2 min during each gas chromatographicrun. Accurate and precise carbon isotope measurements were only obtainedwith Ni/NiO reactors giving a mean deviation Δδ13C from dual inlet measurements of −0.1−0.2‰and a standard deviation (SD) of ±0.4‰. CuO at 800 °Cgave precise, but inaccurate values (Δδ13C= −1.3‰, SD ±0.4‰), whereas CuO/NiO/Pt reactorsat 940 °C gave inaccurate and imprecise data. Accurate (Δδ15N = 0.2‰) and precise (SD ±0.3‰)nitrogen isotope analysis was accomplished with a Ni/NiO-reactor previouslyused for carbon isotope analysis. The applicability of the methodwas demonstrated for alkaline hydrolysis of atrazine at 20 °Cand pH 12 (nucleophilic aromatic substitution) giving ϵcarbon = −5.6‰ ± 0.1‰ (SD) and ϵnitrogen = −1.2‰ ± 0.1‰ (SD).

hub:isPartOfThisJournal

n16:w