Camelina [Camelina sativa L. Crantz], an oilseed crop in the Brassicaceae family, was field tested at multiple locations in the Maritime Provinces of eastern Canada in 2012 to evaluate the effects of N and S on seed yield, protein content, protein yield, oil content, and fatty acid profile. The experiment was designed as a randomized complete block factorial design with six N rates (20, 40, 80, 120, 160, and 200 kg ha -1 N), two S rates (0 and 25 kg ha -1 S) and two lines of camelina (CDI005 and CDI007). The application of N increased the seed yield, protein content, protein yield, and percentage of polyunsaturated fatty acids (PUFA); however, N rate was negatively correlated with oil content and resulted in a reduction of monounsaturated fatty acids (MUFA). The optimum N rate for yield ranged from 120 to 160 kg ha -1 N. Sulfur affected yield, protein content, protein yield, oil content, percentage of MUFA, and percentage of PUFA only when the N level was sufficient.
A newly designed remote probe has been developed for stripping measurements of trace mercury at large sample-instrument distances. Various gold electrodes, stripping modes, and operation conditions have been optimized to meet the requirement of remote monitoring of mercury. The favorable stripping potentiometric response obtained following 0.5-1.0 min deposition, leads to a rapid detection of low ppb mercury concentrations, and offers a fast warning capability. The optimized protocol offers a low detection limit ( of 0.3 mg/L with 5 min deposition) and good precision (RSD of 3.9 % for n ¼ 100). Due to its inherent sensitivity, simplicity, stability, and smaller dimensions the new probe is well suited for in situ monitoring of trace mercury in natural waters.
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