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Speciated Collection of Nitric Acid and Fine Particulate Nitrate for Nitrogen and Oxygen Stable Isotope Determination
Analytical Chemistry ( IF 6.7 ) Pub Date : 2020-12-02 , DOI: 10.1021/acs.analchem.0c03696 Danielle E. Blum 1 , Wendell W. Walters 2 , Meredith G. Hastings 2
Analytical Chemistry ( IF 6.7 ) Pub Date : 2020-12-02 , DOI: 10.1021/acs.analchem.0c03696 Danielle E. Blum 1 , Wendell W. Walters 2 , Meredith G. Hastings 2
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Stable isotopic composition of atmospheric nitrate (nitric acid (HNO3) + particulate nitrate (pNO3–)) provides a higher-order dimensional analysis of critical atmospheric components, enabling a process-level understanding of precursor emissions, oxidation chemistry, aerosol acidity, and depositional patterns. Current methods have not been evaluated for their ability to accurately speciate and determine nitrogen (δ15N) and oxygen (δ18O and Δ17O) isotope compositions for gaseous and particle phases. Suitability of a denuder-filter sampling system for the collection of speciated HNO3(g) and pNO3– for off-line concentration and isotopic determination was tested using both laboratory and field collections. Honeycomb denuders coated with either NaCl or Na2CO3 solutions were used to collect HNO3(g). Laboratory experiments found that both coating solutions quantitatively collected HNO3(g), with the Na2CO3 solution demonstrating a higher operative capacity (>1470 μg of HNO3; n = 25) compared to the NaCl solution (∼750 μg of HNO3; n = 25). The precision values for laboratory-tested HNO3(g) collections are ±0.6‰ and ±1.2‰ for δ15N and δ18O for the NaCl solution and ± 0.8‰ and ±1.2‰ for the Na2CO3 solution. Replicate (urban) samples indicate that the Na2CO3 solution is significantly less selective for HNO3(g) collection than the NaCl solution. Nylon filters were found to collect efficiently and retain laboratory-generated NaNO3 and NH4NO3 particles, with maximum standard deviations for δ15N and δ18O of ±0.3‰ and ±0.3‰, respectively. Field replicates, while predictably more variable, also show consistency for δ15N and δ18O of ±0.6‰ and ±1.3‰ for particulate species, respectively. Recommended methods for field collections of speciated HNO3(g) and pNO3– for isotopic measurements would best utilize the NaCl solution and Nylon filters.
中文翻译：
用于硝酸和氧稳定同位素测定的硝酸和细颗粒硝酸盐的专门收集
大气硝酸盐（硝酸（HNO 3）+硝酸硝酸盐（pNO 3 –））的稳定同位素组成提供了关键大气成分的高次维分析，使您能够从工艺层面了解前体排放，氧化化学，气溶胶酸度，和沉积模式。目前的方法没有被评价它们能够准确speciate和测定氮（δ 15 N）和氧（δ 18 O和Δ 17 O）同位素组成用于气态和颗粒相。裸露过滤器采样系统适用于收集特定的HNO 3（g）和pNO 3的可能性–用于离线浓度和同位素测定的方法使用实验室和野外采集进行测试。用涂有NaCl或Na 2 CO 3溶液的蜂窝状剥蚀器收集HNO 3（g）。实验室实验发现，两种涂料溶液均定量收集HNO 3（g），与NaCl溶液（〜750μgHNO）相比，Na 2 CO 3溶液具有更高的工作能力（> 1470μgHNO 3；n = 25）。3；n = 25）。用于实验室测试HNO的精确度值3（克）的集合是±0.6‰和±1.2‰，δ 15N和δ 18 O可以在NaCl溶液和±0.8‰和±1.2‰的的Na 2 CO 3溶液。复制（城市）样本表明，Na 2 CO 3溶液对HNO 3（g）收集的选择性明显低于NaCl溶液。发现尼龙滤膜有效地收集和保留实验室产生的NaNO 3和NH 4 NO 3级的粒子，最大的标准偏差为δ 15 N和δ 18分别±0.3‰和±0.3‰，O-。场重复，而可以预见多个可变，也示出了用于δ一致性15 N和δ 18颗粒物的O分别为±0.6‰和±1.3‰。推荐的用于收集特定HNO 3（g）和pNO 3的方法-用于同位素测量时，最好使用NaCl溶液和尼龙过滤器。
更新日期：2020-12-15
中文翻译：
用于硝酸和氧稳定同位素测定的硝酸和细颗粒硝酸盐的专门收集
大气硝酸盐（硝酸（HNO 3）+硝酸硝酸盐（pNO 3 –））的稳定同位素组成提供了关键大气成分的高次维分析，使您能够从工艺层面了解前体排放，氧化化学，气溶胶酸度，和沉积模式。目前的方法没有被评价它们能够准确speciate和测定氮（δ 15 N）和氧（δ 18 O和Δ 17 O）同位素组成用于气态和颗粒相。裸露过滤器采样系统适用于收集特定的HNO 3（g）和pNO 3的可能性–用于离线浓度和同位素测定的方法使用实验室和野外采集进行测试。用涂有NaCl或Na 2 CO 3溶液的蜂窝状剥蚀器收集HNO 3（g）。实验室实验发现，两种涂料溶液均定量收集HNO 3（g），与NaCl溶液（〜750μgHNO）相比，Na 2 CO 3溶液具有更高的工作能力（> 1470μgHNO 3；n = 25）。3；n = 25）。用于实验室测试HNO的精确度值3（克）的集合是±0.6‰和±1.2‰，δ 15N和δ 18 O可以在NaCl溶液和±0.8‰和±1.2‰的的Na 2 CO 3溶液。复制（城市）样本表明，Na 2 CO 3溶液对HNO 3（g）收集的选择性明显低于NaCl溶液。发现尼龙滤膜有效地收集和保留实验室产生的NaNO 3和NH 4 NO 3级的粒子，最大的标准偏差为δ 15 N和δ 18分别±0.3‰和±0.3‰，O-。场重复，而可以预见多个可变，也示出了用于δ一致性15 N和δ 18颗粒物的O分别为±0.6‰和±1.3‰。推荐的用于收集特定HNO 3（g）和pNO 3的方法-用于同位素测量时，最好使用NaCl溶液和尼龙过滤器。
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