罐采样与GC-MS联用测定空气中三甲胺

采用真空罐采样,三级冷阱预浓缩仪处理样品,气相色谱-质谱法测定空气中的三甲胺.结果表明,检出限为0.005 mg/m3,相对标准偏差为4.1%,加标回收率为92.0%~108%,能达到国家标准要求.该方法操作简单,测定准确可靠,可用于环境空气中三甲胺的测定.     

气相色谱法测定水中六六六和滴滴涕

采用气相色谱电子捕获检测器对水环境中的六六六和滴滴涕进行分析.水样经过液液萃取浓缩后进样,使用DM-5ms毛细管柱,用外标法定量.结果表明:在所选择的色谱操作条件下,六六六和滴滴涕在0.0096~2.90 mg/L之间线性良好,相关系数大于0.996 4,检出限为0.01~0.04μg/L,水样加标回收率为93%~135%,相对标准偏差为2.4%~4.5%.     

Relations between skylight scattering angle and degree of polarization under different sky conditions

<正>The relations between scattering angle(SA) and the degree of polarization(DOP) of skylights are studied. Measurements under different sky conditions demonstrate that all relation curves between SA and DOP can be described as parabolas.DOP reaches its peak when SA is 90°and the sizes of scattering particles are much smaller than the wavelengths of skylight.The peak value of DOP moves by a small drift when the size of the particle increases.We propose and analyze a polarization dependence model for SA and DOP.Results from simulation are in good agreement with experimental results.     

便携式分光光度法测定水中水合肼的研究

研究了便携式分光光度计在环境应急监测中对水中水合肼的测定方法,选取ZZW-Ⅱ水质多参数现场测试仪,研究了该仪器性能指标以及对实际水质样品测定.结果表明:ZZW-Ⅱ测试仪快速测定水中水合肼方法检出限为0.04 mg/L,测定下限为0.16 mg/L,加标回收率为84%~90%,相对标准偏差为0%~6.2%该仪器操作简单快捷,比较适合用于环境污染事故现场水合肼应急监测.     

氢化物发生--原子荧光法测定水中四价硒

依照国家环境保护标准《地表水环境质量标准》对水中四价硒的规定,2．3-二氨基萘荧光法和原子吸收石墨炉法测定水中四价硒存在严重缺陷,用荧光法测四价硒的方法简便,结果准确。     

吹扫捕集法快速测定地表水中的苯系物

利用吹扫捕集方法对环境水样进行前处理,选用合适的色谱条件对地表水样品进行分析,与国标方法相比,操作简便,快速省时,重复性好.