N-, O- and P-selective on-column atomic emission detection in capillary gas chromatography
N-, O- and P-selective on-column atomic emission detection in capillary gas chromatography
复制标题
毛细管气相色谱中的 N、O 和 P 选择性柱上原子发射检测
DOI：
10.1016/0021-9673(94)00072-7
复制
发表时间：
1994
影响因子：
4.1
通讯作者：
T. Greibrokk
中科院分区：
文献类型：
--
作者：
S. Pedersen‐Bjergaard;T. Greibrokk
评估了柱上持续的 350 kHz He 等离子体，用于毛细管气相色谱中的 N、O 和 P 选择性原子发射检测。由于当维持在 2.0 ml/min 的载气中时，等离子体会引起峰拖尾，因此在放电中添加了 15 ml/min 的辅助氦气。对于N-和O-选择性检测，分别使用CH4与O2或N2混合作为等离子体掺杂剂。即使采用这种广泛的等离子体掺杂，由于原子 N 和 O 背景水平的暂时变化，洗脱碳氢化合物也会产生非特异性响应。如果没有背景校正，N 和 O 的元素与碳选择性分别限制为 100:1 和 40:1。对于这两种元素，获得了 50 pg/s 水平的检测限和 5 · 102 的线性度。以H2-CH4为等离子体掺杂剂进行P选择性检测，P的检出限为39 pg/s。磷碳选择性为2300:1，线性为2·102。经过背景校正，选择性和检出限有望显着提高。
A 350-kHz He plasma sustained on-column was evaluated for N-, O- and P-selective atomic emission detection in capillary gas chromatography. As the plasma caused peak tailing when sustained in 2.0 ml/min of carrier gas, 15 ml/min of auxiliary helium was added to the discharge. For N- and O-selective detection, CH4mixed with O2or N2, respectively, were used as plasma dopant. Even with this extensive plasma doping, non-specific responses arose from eluting hydrocarbons due to temporary changes in the background level of atomic N and O. Without background correction, element-to-carbon selectivities for N and O were limited to 100:1 and 40:1, respectively. For both elements, detection limits at the 50 pg/s level and linearities of 5 · 102were obtained. P-selective detection was carried out with H2-CH4as plasma dopant, and provided a 39 pg/s detection limit for P. The phosphorus-to-carbon selectivity was 2300:1 and the linearity was 2 · 102. With background correction, both selectivities and detection limits are expected to improve significantly.