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对比不同显色温度及保存方式下的甲醛样品吸光度及含量,结果表明,样品显色完全所需时间随显色温度的升高而缩短,当温度低于22℃时,显色反应应在恒温水浴锅34℃保温10 min。另外,冰箱内冷藏保存的样品稳定性要优于常温保存,常温下甲醛样品应在采样后12 h内检测,而冷藏时甲醛样品可至少稳定48 h。  相似文献   
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A new complex, [Zn_2(HL)_2(2,5-OH-pbda)]n(1, L = 1-(1 H-imidazol-4-yl)-4-(4 Htetrazol-5-yl)benzene(H_2L) and 2,5-OH-H_2 pbda = 2,5-dihydroxy-terephthalic acid), has been hydrothermally prepared and characterized by single-crystal X-ray diffraction, IR spectroscopy, elemental analysis and PXRD. Complex 1 crystallizes in monoclinic, space group P2_1/n with a = 8.8101(10), b = 17.105(2), c = 9.4014(11) ?, β = 105.704(2)o, V = 1363.9(3) ?`3, Z = 4, C_(14)H_9N_6O_3Zn, M_r = 374.64, D_c = 1.824 g/cm~3, μ = 1.831 mm~(-1), S = 1.042, F(000) = 756, the final R = 0.0309 and w R = 0.1003 for 3130 observed reflections(I 2σ(I)). The H_2L ligand was deprotonated to be an HL-anion, and coordinated with Zn~(2+) to form two-dimensional(2D) Zn_2(HL~-)_2~(2+) sheets, which were pillared by the 2,5-OH-pbda2-ligands to form a three-dimensional(3D) dmc net with Point(Schl?fli) symbol of(4·82)(4·85). The large vacancy of the dmc net is filled via mutual interpenetration of another independent framework, leading to the formation of a 2-fold interpenetrating architecture. Solid state luminescent property of 1 has been investigated.  相似文献   
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优化了固体吸附/热解吸-气相色谱法测定室内空气中苯、甲苯、乙苯、对二甲苯、间二甲苯、异丙苯、邻二甲苯和苯乙烯等8种苯系物的方法。结果表明,目标物色谱峰分离度均大于1.5;在10~500 ng范围内,8种苯系物质量与色谱峰面积呈良好的线性,相关系数r为0.999 7~0.999 9;该方法的检出限为0.50~3.48ng,当采气量为2L时,最低检出浓度为0.25×10~(-3)~1.74×10~(-3)mg/m~3,相对标准偏差为1.2%~9.1%(n=6),回收率在94.0%~99.5%之间。该方法分离效果好,灵敏度高,精密度好,结果准确,可用于室内空气中苯系物含量的检测。  相似文献   
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