Water of Crystallization in Total Solids of Water Analysis

Sokoloff, V.P.

doi:10.1021/ac50085a023

Cited by 9 publications

(1 citation statement)

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“…The SO 4 −S content was analyzed by FIA (Madsen and Murphy 1981, Application note ASTN42/86 Tecator, detection limit 10 μg l −1 ). The dissolved substances (dry weight, DW) content was deter− mined by evaporation and drying at 105°C (Howard 1933;Sokoloff 1933). Cation contents (Na, K, Ca, Mg) were analyzed by a Varian Spectra AA 640 polarized atomic absorption spectrophotometer (Techtron, Australia).…”

Section: Water Level and Water Physico−chemical Parametersmentioning

confidence: 99%

Impact of warming on Nostoc colonies (Cyanobacteria) in a wet hummock meadow, Spitsbergen

Elster¹,

Kvíderová²,

Hájek³

et al. 2012

Polish Polar Research

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Abstract:In order to simulate the warming effects on Arctic wetlands, three passive open−top chambers (OTCs) and three control cage−like structures (CCSs) equipped with soil temperature and soil volumetric water content (VWC) probes for continuous micro− climatic measurements were installed in a wet hummock meadow, Petuniabukta, Bille− fjorden, central Spitsbergen, in 2009. The warming effects on primary productivity were investigated during summer seasons 2009 and 2010 in cyanobacterial colonies of Nostoc commune s.l., which plays an important role in the local carbon and nitrogen cycles. The microclimatic data indicated that the effect of OTCs was dependent on microtopography. During winter, two short−term snow−thaw episodes occurred, so that liquid water was available for the Nostoc communities. Because of the warming, the OTC hummock bases remained unfrozen three weeks longer in comparison to the CCSs and, in spring, the OTC hummock tops and bases exceeded 0°C several days earlier than CCS ones. Mean summer temperature differences were 1.6°C in OTC and CCS hummock tops, and 0.3°C in the OTC and CCS hummock bases. The hummock tops were drier than their bases; however the VWC difference between the OTCs and CCSs was small. Due to the only minor differ− ences in the microclimate of OTC and CCS hummock bases, where the Nostoc colonies were located, no differences in ecophysiological characteristics of Nostoc colonies ex− pressed as photochemistry parameters and nitrogenase activities were detected after two years exposition. Long−term monitoring of Nostoc ecophysiology in a manipulated envi− ronment is necessary for understanding their development under climate warming.

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Section: Water Level and Water Physico−chemical Parametersmentioning

confidence: 99%