An automated, laser-based measurement system for nitrous oxide isotope and isotopomer ratios at nanomolar levels.
An automated, laser-based measurement system for nitrous oxide isotope and isotopomer ratios at nanomolar levels.
复制标题
基于激光的自动化测量系统,用于纳摩尔水平的一氧化二氮同位素和同位素异构体比率
DOI:
10.1002/rcm.8502
复制
发表时间:
2019
期刊:
影响因子:
--
通讯作者:
Grundle
中科院分区:
文献类型:
--
作者:
Grundle
RationaleNitrous oxide (N2O) is an atmospheric trace gas regulating Earth's climate, and is a key intermediate of many nitrogen cycling processes in aquatic ecosystems. Laser‐based technology for N2O concentration and isotopic/isotopomeric analyses has potential advantages, which include high analytical specificity, low sample size requirement and reduced cost.MethodsAn autosampler with a purge‐and‐trap module is coupled to a cavity ring‐down spectrometer to achieve automated and high‐throughput measurements of N2O concentrations, N2O isotope ratios (δ15Nbulkand δ18O values) and position‐specific isotopomer ratios (δ15Nαand δ15Nβvalues). The system provides accuracy and precision similar to those for measurements made by traditional isotope ratio mass spectrometry (IRMS) techniques.ResultsThe sample sizes required were 0.01–1.1 nmol‐N2O. Measurements of four N2O isotopic/isotopomeric references were cross‐calibrated with those obtained by IRMS. With a sample size of 0.50 nmol‐N2O, the measurement precision (1σ) for δ15Nα, δ15Nβ, δ15Nbulkand δ18O values was 0.61, 0.33, 0.41 and 0.43‰, respectively. Correction schemes were developed for sample size‐dependent isotopic/isotopomeric deviations. The instrumental system demonstrated consistent measurements of dissolved N2O concentrations, isotope/isotopomer ratios and production rates in seawater.ConclusionsThe coupling of an autosampler with a purge‐and‐trap module to a cavity ring‐down spectrometer not only significantly reduces sample size requirements, but also offers comprehensive investigation of N2O production pathways by the measurement of natural abundance and tracer level isotopes and isotopomers. Furthermore, the system can perform isotopic analyses of dissolved and solid nitrogen‐containing samples using N2O as the analytical proxy.
登录
查看更多内容
DOI:
--
发表时间:
2006
期刊:
影响因子:
--
作者:
S. Walter;U. Breitenbach;H. Bange;G. Nausch;D. Wallace
通讯作者:
D. Wallace
DOI:
--
发表时间:
2016
期刊:
影响因子:
--
作者:
S. Toyoda;N. Yoshida
通讯作者:
N. Yoshida
影响因子:
18.3
作者:
Fawcett, Sarah E.;Lomas, MichaelW.;Sigman, Daniel M.
通讯作者:
Sigman, Daniel M.
影响因子:
2.8
作者:
K. Jørgensen;H. B. Jensen;J. Sørensen
通讯作者:
J. Sørensen
影响因子:
7.4
作者:
Casciotti, KL;Sigman, DM;Hilkert, A
通讯作者:
Hilkert, A