کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1241179 | 969172 | 2008 | 7 صفحه PDF | دانلود رایگان |
Continuous flow generation of Br2, Cl2 and H2S coupled to a low-power 2.45 GHz microwave microstrip He plasma exiting from a capillary gas channel in a micro-fabricated sapphire wafer with microstrip lines has been used for the optical emission spectrometric determination of Br, Cl and S using a miniaturized optical fiber CCD spectrometer. Under optimized conditions, detection limits (3σ) of 330, 190 and 220 μg l− 1 for Br, Cl and S, respectively, under the use of the Br II 478.5 nm, Cl I 439.0 nm and S I 469.0 nm lines were obtained and the calibration curves were found to be linear over 2 orders of magnitude. In addition, when introducing CO2 and using the rotational line of the CN molecular band at 385.7 nm the detection limit for C was 4.6 μg l− 1. The procedure developed was found to be free from interferences from a number of metal cations and non-metal anions. Only the presence of CO32− and CN− was found to cause severe spectral interferences as strong CN and C2 molecular bands occurred as a result of an introduction of co-generated CO2 and HCN into the plasma. With the procedure described Br, Cl and S could be determined at a concentration level of 10–30 mg l− 1 with accuracy and precision better than 2%.
Journal: Spectrochimica Acta Part B: Atomic Spectroscopy - Volume 63, Issue 3, March 2008, Pages 415–421