부산대학교 도서관

Automatic samplers represent a convenient way to gather rain samples for isotope ([delta].sup.18 O and [delta].sup.2 H) and water quality analyses. Yet, most commercial collectors are expensive and do not reduce post-sampling evaporation and the associated isotope fractionation sufficiently. Thus, we have developed a microcontroller-based automatic rain sampler for timer-actuated collection of integral rain samples. Sampling periods are freely selectable (minutes to weeks), and the device is low-cost, simple, robust, and customizable. Moreover, a combination of design features reliably minimizes evaporation from the collection bottles. Evaporative losses were assessed by placing the pre-filled sampler in a laboratory oven with which a diurnal temperature regime (21-31 .sup.∘ C) was simulated for 26 weeks. At the end of the test, all bottles had lost less than 1 % of the original water amount, and all isotope shifts were within the analytical precision. These results show that even multi-week field deployments of the device would result in rather small evaporative mass losses and isotope shifts. Hence, we deem our sampler a useful addition to devices that are currently commercially available and/or described in the scientific literature. To enable reproduction, all relevant details on hard- and software are openly accessible.
Byline: Nils Michelsen, Gerrit Laube, Jan Friesen, Stephan M. Weise, Ali Bakhit Ali Bait Said, Thomas Mü,ller To access, purchase, authenticate, or subscribe to the full-text of this article, please [...]