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| Aliquots of saturated sodium 3-nitrobenzenesulphonate and sodium 4-nitrobenzenesulphonate solutions are transferred through a coarse filter into a tarred volumetric flask. The concentration of 3- or/and sodium 4-nitrobenzenesulphonate in water is determined using a Shimadzu-6A high-performance liquid phase chromatograph (HPLC). The Diamonsil C18 (150 mm×4.6mm) chromatographic column is used. The mobile phase consists of three eluents which are water, Na2SO4 and H3PO4. The uncertainty of the measurement is less than 0.001 g of sodium 3-nitrobenzenesulphonate or sodium 4-nitrobenzenesulphonate per 100 g of water. The densities (ρ) of the equilibrium liquid phase are measured using a pycnometer (11-FY) with an uncertainty of 0.0002 gcm-3. The densities of the equilibrated solution were measured with a gravity bottle method with a precision of (0.0002 g and used for mass fraction calculation of liquid components. The specific gravity bottle method with correction of the air floating force was used. The density of dry air at 293.15 K and normal atmospheric pressure. Each analysis is repeated three times, and the average value of the three measurements is considered as the final value of the analysis.18-19 |
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至尊木虫 (职业作家)
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sltmac: 金币+1 2012-04-22 08:30:20
-轩影鳶: 金币+10, 翻译EPI+1, ★★★★★最佳答案 2012-04-22 09:24:43
sltmac: 金币+1 2012-04-22 08:30:20
-轩影鳶: 金币+10, 翻译EPI+1, ★★★★★最佳答案 2012-04-22 09:24:43
| 通过布氏漏斗转移间硝基苯磺酸钠和对硝基苯磺酸钠到圆底烧瓶中。用HPLC（Shimadzu-6A）检测它们在水中的浓度。我们使用C18柱。流动相由水，Na2SO4和H3PO4组成。每100g水中，间硝基苯磺酸钠和对硝基苯磺酸钠的检测误差为0.001g。平衡时，溶液密度误差为0.0002g/cm3。平衡溶液的密度由比重瓶测量，用于计算溶液的组分。这种比重瓶测量的方法由空气浮力校正。在293.15K正常大气压下测量的干燥空气的密度。每一个分析重复三次，三次测量的平均值作为最后值。 |
2楼2012-04-22 07:50:09