Warner Daniel L, Oviedo-Vargas Diana, Royer Todd V
School of Public and Environmental Affairs, Indiana University, 702 N. Walnut Grove Ave, Bloomington, IN, 47405, USA.
Environ Monit Assess. 2015 Jan;187(1):4208. doi: 10.1007/s10661-014-4208-5. Epub 2014 Dec 14.
Traditional sampling methods for dissolved organic matter (DOM) in streams limit opportunities for long-term studies due to time and cost constraints. Passive DOM samplers were constructed following a design proposed previously which utilizes diethylaminoethyl (DEAE) cellulose as a sampling medium, and they were deployed throughout a temperate stream network in Indiana. Two deployments of the passive samplers were conducted, during which grab samples were frequently collected for comparison. Differences in DOM quality between sites and sampling methods were assessed using several common optical analyses. The analyses revealed significant differences in optical properties between sampling methods, with the passive samplers preferentially collecting terrestrial, humic-like DOM. We assert that the differences in DOM composition from each sampling method were caused by preferential binding of complex humic compounds to the DEAE cellulose in the passive samplers. Nonetheless, the passive samplers may provide a cost-effective, integrated sample of DOM in situations where the bulk DOM pool is composed mainly of terrestrial, humic-like compounds.
由于时间和成本限制，传统的河流溶解有机物（DOM）采样方法限制了长期研究的机会。被动式DOM采样器是按照先前提出的设计构建的，该设计使用二乙氨基乙基（DEAE）纤维素作为采样介质，并将其部署在印第安纳州的一个温带河流网络中。进行了两次被动采样器的部署，在此期间经常采集抓取样本进行比较。使用几种常见的光学分析方法评估了不同站点和采样方法之间DOM质量的差异。分析表明，采样方法之间的光学特性存在显著差异，被动采样器优先收集陆地来源的、类腐殖质的DOM。我们认为，每种采样方法所采集的DOM组成差异是由被动采样器中复杂腐殖化合物与DEAE纤维素的优先结合所致。尽管如此，在大部分DOM库主要由陆地来源的、类腐殖质化合物组成的情况下，被动采样器可能会提供一种经济高效的DOM综合样本。
