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烷基醇聚氧乙烯醚中二噁烷的测定 总被引:6,自引:2,他引:6
采用顶空气相色谱法测定了烷基醇聚氧乙烯醚中的二口恶烷。研究了顶空条件,标准曲线的相关系数为0.9989,检出限为20μg/L,回收率为91.6%~97.6%,相对标准偏差小于2.5%。 相似文献
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1引言随着现代工业的发展和人民生活水平的提高,家用洗涤剂的使用范围越来越广,使用量也在不断增加。烷基醇聚氧乙烯醚是液体洗涤剂的有效成份,其合成过程中产生的二噁烷是有害物质,虽其含量较低,但它能通过蒸气形式吸入人体,与眼、皮肤等接触,侵害人的肝、肾、皮肤、眼睛等多个部位,且能在人体内积蓄,给人们的健康造成危害。聚氧乙烯醚中二噁烷的测定尚未见报道。本文采用顶空气相色谱法对烷基醇聚氧乙烯醚中的二噁烷进行测定,选择了顶空条件,以保留值和加入已知物增加峰高法定性,外标法定量,建立了简便、准确、灵敏的分析测… 相似文献
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Nonlinear optical frequency mixing,which describes new frequencies generation by exciting nonlinear materials with intense light field,has drawn vast interests in the field of photonic devices,material characterization,and optical imaging.Investigating and manipulating the nonlinear optical response of target materials lead us to reveal hidden physics and develop applications in optical devices.Here,we report the realization of facile manipulation of nonlinear optical responses in the example system of MoS2 monolayer by van der Waals interfacial engineering.We found that,the interfacing of monolayer graphene will weaken the exciton oscillator strength in MoS2 monolayer and correspondingly suppress the second harmonic generation(SHG)intensity to 30%under band-gap resonance excitation.While with off-resonance excitation,the SHG intensity would enhance up to 130%,which is conjectured to be induced by the interlayer excitation between MoS2 and graphene.Our investigation provides an effective method for controlling nonlinear optical properties of two-dimensional materials and therefore facilitates their future applications in optoelectronic and photonic devices. 相似文献
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烷基醇聚氧乙烯醚中二噁烷的测定 总被引:6,自引:0,他引:6
采用顶空气相色谱法测定了烷基醇聚氧乙烯醚中的二口恶烷。研究了顶空条件,标准曲线的相关系数为0.9989,检出限为20μg/L,回收率为91.6%~97.6%,相对标准偏差小于2.5%。 相似文献
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二羟丙酮的气相色谱分析 总被引:1,自引:0,他引:1
用衍生气相色谱法测定了二羟丙酮的酶制法体系中二羟丙酮的含量,选用六甲基二硅胺烷(HMDS)、六甲基二硅胺烷加三甲基氯硅烷(TMCS)、N,O-双(三甲基硅烷基)乙酰胺(BSA)为衍生试剂,并对其衍生条件进行了研究。该法的回收率为98.31%~101.31%,RSD为2.02%~3.58%。 相似文献
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