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首页> 外文期刊>Electrophoresis: The Official Journal of the International Electrophoresis Society >Vapor and liquid phase detection of cyanide on a microchip
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Vapor and liquid phase detection of cyanide on a microchip

机译：微芯片上氰化物的汽相和液相检测

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A capillary electrophoresis microchip is used to selectively and sensitively monitor cya- nide levels in both vapor (HCN(g)) and aqueous (NaCN in drinking water) phases. Laser-induced fluorescence detection is applied using a violet diode laser to monitor the fluorescent isoindole derivative formed by the reaction of cyanide with 2,3-naphthal-enedicarboxaldehyde (NDA) and taurine. Air sampling of hydrogen cyanide is achieved using a miniature impinger (2 mL), giving collection efficiencies as high as 79% for a sampling rate of 1.0 L/min and a 10 s sampling time (relative standard deviation RSD: 2.7% for n = 5). Following the addition of NDA and taurine to either the vapor phase impinger sample or an aqueous drinking water sample, the NDA/cyanide derivative can be detected in just over 40 s on the microchip, giving a detection limit of 0.56 mug/L and a linear dynamic range from 0.56 mug/L-2.4 mg/L. The detection limit for hydrogen cyanide in air was determined to be 2.3 ppb (mole%). On-chip derivatization of cyanide by NDA was successful, although a 50% decrease in signal intensity was observed due to insufficient time for completion of the reaction on the microchip. A number of different interferents were examined, and only iron(II) and chlorine showed any interference due to their capability for masking the presence of cyanide by reacting with free cyanide in solution. [References: 16]
机译：毛细管电泳微芯片用于选择性和灵敏地监测蒸气（HCN（g））和水相（饮用水中的NaCN）中的氰化物水平。使用紫光二极管激光器进行激光诱导的荧光检测，以监测由氰化物与2，3-萘-二烯基甲醛（NDA）和牛磺酸反应形成的荧光异吲哚衍生物。使用微型撞击器（2 mL）对氰化氢进行空气采样，采样率为1.0 L / min，采样时间为10 s时，收集效率高达79％（相对标准偏差RSD：2.7％，n = 5）。将NDA和牛磺酸添加到汽相冲击器样品或饮用水水溶液样品中后，可以在微芯片上检测40 s以上的NDA /氰化物衍生物，检测限为0.56杯/升，线性动态范围为0.56杯/L-2.4 mg / L。空气中氰化氢的检出限确定为2.3 ppb（摩尔％）。尽管由于没有足够的时间在微芯片上完成反应而观察到信号强度降低了50％，但是NDA可以使氰化物在芯片上成功衍生化。检查了许多不同的干扰物，只有铁（II）和氯显示出任何干扰，这是由于它们具有通过与溶液中的游离氰化物反应来掩盖氰化物存在的能力。 [参考：16]

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