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Contamination of groundwater wells by arsenic is a major problem in China. This study compared arsenic removal efficiency of five sand-based point-of-use filters with the aim of selecting the most effective filter for use in a village in Shanxi province, where the main groundwater source had arsenic concentration >200 μg/L. A biosand filter, two arsenic biosand filters, a SONO-style filter and...
Nine novel compounds, six euphane triterpenes, Euphorol A–D (1–4), H (8) and I (9), and three tirucallane triterpenes, Euphorol E–G (5–7) including four nortriterpenes, together with seven known compounds (10–16) have been isolated from the methanol extraction of Euphorbium. Their structures were established on the basis of extensive analyses of their HR-ESI-MS, UV, IR, 1D and 2D NMR methods. A putative...
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