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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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本文用顶空气相色谱法,以GDX-101为固定相,测定了延生护宝液中甲醇残留量,方法的回收率在85.9%-101.6%之间,变异系数0.3%,最小检出量1.0mg/L。 相似文献
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线性迭代法同时测定小儿退热灵片中乙酰水杨酸和苯巴比妥的含量 总被引:1,自引:1,他引:0
本文利用线性迭代法同时测定了小儿退热灵片中乙酰水扬酸和苯巴比妥的含量。乙酰水杨酸的回收率为99.6%(RSD=0.58%,n=6),苯巴比妥的回收率为100.4%(RSD=1.66%,n=6)。本法测定结果与黑龙江省药品标准方法测定结果基本一致,本法简单,快速,适合该剂剂中两组份的同时测定。 相似文献
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本文研究了快速、简便测定蜂皇浆及制品中添加的低含量维生素B_6的HPLC法。称取适量样品,用10%偏磷酸提取、净化,清液供HPLC分析用。WATERS荧光检测器,激发波长290nm,发射波长390nm,VB_6含量在0~120ng之间工作曲线相关系数大于0.999,样品中VB_6含量为0.1%~5%时,方法回收率为92.17%~98.42%,相对标准偏差(n=6)小于3.7%。 相似文献
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顶空气相色谱法测定头孢氨苄中有机残留溶剂甲醇 总被引:9,自引:0,他引:9
采用顶空气相色谱法测定了头孢氨苄中有机残留溶剂甲醇的含量;以0.5mol/L氢氧化钠溶液为溶剂制备供试品溶液,以ChrompackCP-Si 8CB弹性石英毛细管柱为分离柱,研究了盐析效应、顶空加热温度和顶空热平衡时间对甲醇测定的影响;当添加水平为96.0μg时,回收率为98%~104%,测定相对标准偏差RSD为1.2%(n=6),检出限为0.5mg/L(信噪比为3:1),甲醇质量浓度为9.6~153.6mg/L时,线性相关系数为0.9999。 相似文献
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火焰原子吸收法测定胃乃安胶囊中铜铅含量 总被引:1,自引:0,他引:1
采用干灰化法处理样品,火焰原子吸收光谱法测定胃乃安胶囊中铜、铅含量,用氚灯背景校正,有效地消除了基体干扰,方法的检出限为Cu:0.023mg/L,pb:0.070mg/L,RSD在2.9%~5.6%之间,回收率分别为Cu:93%~103.6%;pb:88.2%~95.0%。 相似文献
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注射用舒尔哌酮的高效液相色谱分析 总被引:1,自引:0,他引:1
建立了高效液相色谱法分离与测定复方制剂舒尔哌酮中斯巴坦及头孢哌酮的含量。采用C_(18),10μm,4.6mm×250mm(大连化物所Spherisorb)柱,以0.25%三乙胺溶液(用磷酸调pH6.0)+乙腈(86.5+13.5)为流动相,在紫外检测器210nm波长处进行检测,线性范围0.05~0.6mg/mL,γ=0.9999(n=5),精密度:斯巴坦及头孢哌酮的日内平均RSD分别为0.6%及0.75%(n=18),日间平均RSD分别为0.86%及0.87%(n=12)。 相似文献
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建立了化妆品中二噁烷的同位素稀释-顶空气相色谱-质谱联用测定方法。称取2 g化妆品样品于顶空样品瓶中,加入1 g氯化钠及20 mg/L氘代二噁烷内标溶液1 mL,再加入9 mL水。密封后摇匀,置于顶空进样器中,在70℃平衡40 min。气液平衡后的上部气体经HP-5 MS石英毛细管气相色谱柱(30 m×0.25 mm×0.25μm)分离后,采用选择离子扫描模式进行质谱定性及定量分析。二噁烷的方法定量限为2.5 mg/kg;在2.5~50 mg/kg的3个添加水平范围内的平均回收率为90.5%~104.0%,相对标准偏差为1.26%~3.98%。本方法准确、简便、快速,能够满足化妆品样品中二噁烷残留量的检测要求。 相似文献
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顶空气相色谱-质谱法测定玩具中的10种挥发性有机物 总被引:1,自引:0,他引:1
建立了检测玩具中10种挥发性有机物(VOC)残留量的顶空气相色谱-质谱(HS-GC-MS)方法。样品经140 ℃、45 min静态顶空后,通过DB-624色谱柱分离和质谱检测,外标法定量。该方法对于不同VOC的定量限(LOQ)均在0.66 mg/kg以下,线性范围为0.001~2.0 μg,平均回收率在79%~106%之间,相对标准偏差(RSD)在0.4%~5.6%之间。该方法具有准确灵敏、简单快速等特点,将其应用于实际玩具样品的检测取得了良好效果。 相似文献
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顶空气相色谱法测定化妆品中15种挥发性有机溶剂残留 总被引:1,自引:0,他引:1
建立了化妆品中15种挥发性有机溶剂残留的顶空气相色谱测定方法。样品经60 ℃、30 min静态顶空后,采用气相色谱-氢火焰离子化检测器进行检测,外标法定量。加标回收试验结果表明: 15种挥发性有机溶剂残留平均回收率为62.8%~116%,相对标准偏差均小于5%。方法的检出限为0.09~0.68 mg/kg。该方法可有效克服基体干扰,一次进样可同时分离和测定化妆品中15种挥发性有机溶剂,准确灵敏,简单快速,适用于化妆品中挥发性有机溶剂残留的检测。 相似文献
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以二氧六环为良溶剂,石油醚为沉淀剂,通过等温沉淀分级,制得8种不同分子量的聚丙烯酸标样。 采用渐近校正法测定了它们的峰值分子量和分子量分布,建立了GPC校正曲线,并将其用于聚丙烯酸试样的测定。 结果表明,由渐进校正法测得的粘均分子量与粘度法测得的分子量之间的平均相对误差为7%,由渐进校正法测得的数均分子量与端基滴定法测得分子量之间的平均相对误差为9%。 将上述标样用于实际聚丙烯酸试样的测定,测得试样的粘均分子量与粘度法测定结果之间平均相对误差小于10%,优于以聚乙二醇为标样测定的平均相对误差(30%左右)。 本标样可用于具有与聚丙烯酸相似结构的阴离子聚电解质分子量分布的测定。 相似文献
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《Journal of separation science》2017,40(12):2584-2590
We demonstrate a reaction headspace gas chromatographic method for quantifying anhydride groups in anhydride‐based epoxy hardeners. In this method, the conversion process of anhydride groups can be realized by two steps. In the first step, anhydride groups in anhydride‐based epoxy hardeners completely reacted with water to form carboxyl groups. In the second step, the carboxyl groups reacted with sodium bicarbonate solution in a closed sample vial. After the complete reaction between the carboxyl groups and sodium bicarbonate, the CO2 formed from this reaction was then measured by headspace gas chromatography. The data showed that the reaction in the closed headspace vial can be completed in 15 min at 55°C, the relative standard deviation of the reaction headspace gas chromatography method in the precision test was less than 3.94%, the relative differences between the new method and a reference method were no more than 9.38%. The present reaction method is automated, efficient and can be a reliable tool for quantifying the anhydride groups in anhydride‐based epoxy hardeners and related research. 相似文献
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《Journal of separation science》2018,41(5):1091-1095
We investigate a simple and accurate method for quantitatively analyzing dissolved inorganic carbon in environmental water by reaction headspace gas chromatography. The neutralization reaction between the inorganic carbon species (i.e. bicarbonate ions and carbonate ions) in environmental water and hydrochloric acid is carried out in a sealed headspace vial, and the carbon dioxide formed from the neutralization reaction, the self‐decomposition of carbonic acid, and dissolved carbon dioxide in environmental water is then analyzed by headspace gas chromatography. The data show that the headspace gas chromatography method has good precision (relative standard deviation ≤ 1.63%) and accuracy (relative differences ≤ 5.81% compared with the coulometric titration technique). The headspace gas chromatography method is simple, reliable, and can be well applied in the dissolved inorganic carbon detection in environmental water. 相似文献
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Measurement of water absorption capacity in wheat flour by a headspace gas chromatographic technique
《Journal of separation science》2018,41(13):2731-2735
The purpose of this work is to introduce a new method for quantitatively analyzing water absorption capacity in wheat flour by a headspace gas chromatographic technique. This headspace gas chromatographic technique was based on measuring the water vapor released from a series of wheat flour samples with different contents of water addition. According to the different trends between the vapor and wheat flour phase before and after the water absorption capacity in wheat flour, a turning point (corresponding to water absorption capacity in wheat flour) can be obtained by fitting the data of the water gas chromatography peak area from different wheat flour samples. The data showed that the phase equilibrium in the vial can be achieved in 25 min at desired temperature (35°C). The relative standard deviation of the reaction headspace gas chromatographic technique in water absorption capacity determination was within 3.48%, the relative differences has been determined by comparing the water absorption capacity obtained from this new analytical technique with the data from the reference technique (i.e., the filtration method), which are less than 8.92%. The new headspace gas chromatographic method is automated, accurate and be a reliable tool for quantifying water absorption capacity in wheat flour in both laboratory research and mill applications. 相似文献