CAJ | 학술논문

氮氧化物(NO_x)是大气二次光化学污染臭氧的重要前体物,但目前对其总量和分量的测量仍存在着一些难以解决的问题.选择3种不同原理的市售氮氧化物分析仪在广东和北京进行比对观测实验,从而比较其各自的优缺点及适用性.结果表明,钼转化法(MC)测得的NO_x比光转化法(LC)及液相化学发光法(LPC)所测得的值都明显偏高,可近似认为是NO_y.LPC检测NO_2时受到PAN等含有-NO_2生色基团的干扰,结果比LC略高.LC测得的NO_x值与实际大气最为接近.MC测定的NO,比实际值高,但能满足空气质量指标监测的需求;LC能够准确测定大气中的NO_x,但造价太高,仅适用于大气化学机理研究;而LPC原理的仪器适合于短时间的航测、高塔和系留艇进行垂直梯度观测.
담양화물(NO_x)시대기이차광화학오염취양적중요전체물,단목전대기총량화분량적측량잉존재착일사난이해결적문제.선택3충불동원리적시수담양화물분석의재엄동화북경진행비대관측실험,종이비교기각자적우결점급괄용성.결과표명,목전화법(MC)측득적NO_x비광전화법(LC)급액상화학발광법(LPC)소측득적치도명현편고,가근사인위시NO_y.LPC검측NO_2시수도PAN등함유-NO_2생색기단적간우,결과비LC략고.LC측득적NO_x치여실제대기최위접근.MC측정적NO,비실제치고,단능만족공기질량지표감측적수구;LC능구준학측정대기중적NO_x,단조개태고,부괄용우대기화학궤리연구;이LPC원리적의기괄합우단시간적항측、고탑화계류정진행수직제도관측.
Nitrogen oxides (NO_x) is one of important precursors of ozone (O_3), which is the most wellknown secondary air pollutant produced from photochemical reactions. At present, some difficulties about accurately measuring the components and total amount of NO_x are still existed. Three nitrogen-oxide analyzers with different principles were conducted in Guangdong and Beijing station respectively to compare their advantage,disadvantage and applicability. The results showed that the value of NO_x measured by the method of MO converter (MC) was much higher than that of light eonverter (LC) and liquid-phase chemiluminescence (LPC), which can be approximately thought as NO_y. LPC was interfered by the PAN and materials containing chromogenie radical-NO_2, so the result of which was slightly higher than that of LC. Compared to the other two methods, the value measured by LC was mostly closed to the actual value of NO_x in atmosphere. Although the value of NO_x measured by MC was higher than the real concentration, it still could conform to the requirement of monitoring air quality indexes. The method of LC could accurately measure ambient NO_x, but due to its high price, it was mainly applied on studying the mechanism of atmospheric chemistry. And the LPC analyzer is appropriate to measure NO_x at short time in aerial, tower and tethered airship for vertical observation.