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采用微波消解处理祁东、德化和咸阳产地的黄花菜样品,利用ICP-OES(电感耦合等离子体发射光谱)法同时测定黄花菜中多种矿质元素的含量。结果表明:三个样品中均含有Na、Ca、K、Mg、Al、Fe、Zn、Sr、Mn、B、Si、Ba、Cr、S、P等15种矿质元素,未发现Tl、Ti、Cd和Pb元素;黄花菜中富含Na、Ca、K、Mg元素,Mn、Ba元素的含量相对较少。该方法简单精确,其检出限为0. 001~2. 405 mg/L,测定结果的RSD在0. 35%~7. 41%之间,可用于不同产地黄花菜中多元素的同时分析。 相似文献
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采用紫外可见分光光度法对山西、陕西和甘肃等3个产地的10批次蒙古黄芪中的补气主成分多糖和皂苷的含量进行了分析比较.结果表明,不同产地蒙古黄芪中的多糖含量大小为:甘肃(31.34%)>陕西(30.96%)>山西(27.44%),皂苷含量大小为:甘肃(47.57%)>山西(43.30%)>陕西(38.77%);甘肃蒙古黄芪中的多糖和皂苷含量均最高,山西蒙古黄芪中的皂苷含量高于陕西的,而陕西蒙古黄芪中的多糖含量高于山西的;黄芪在甘肃能较好生长,能更好地发挥其补气功效.该研究为补气作用蒙古黄芪的产地优选和药材深加工提供了参考. 相似文献
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火焰原子吸收法测定不同产地香菇中4种微量元素 总被引:1,自引:0,他引:1
《广州化工》2016,(3)
比较不同产地香菇中Fe、Mn、Zn、Cu 4种微量元素的含量。采用火焰原子吸收法测定不同产地香菇中Fe、Mn、Zn、Cu的含量。结果表明:产地不同的香菇中四种微量元素的含量各不相同,其中Fe和Zn的含量相对较高,Fe最高可达293.47 mg/kg,Zn最高可达69.691 mg/kg;而Cu和Mn的含量相对较低,Cu最高可达35.401 mg/kg,Mn最高可达16.507 mg/kg。不同香菇中对相同元素的富集能力差别较大,福建龙岩(武夷山野生红菇)中各种微量元素均为最高。 相似文献
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以葛根素为对照,利用紫外分光光度法测定不同产地野葛根的总黄酮含量,并比较了不同产地野葛根中总黄酮的含量。结果表明,不同产地野葛根的总黄酮含量为云南3.27%、贵州3.71%、广东2.05%、广西2.67%。各地野葛根中总黄酮含量由多到少依次为贵州、云南、广西、广东。 相似文献
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ICP-AES法测定马来松香中金属离子含量 总被引:2,自引:0,他引:2
采用干法灰化处理马来松香样品,用ICP-AES法测定了其中Fe、Al、Zn、Cu、Pb和Ni金属离子的含量。通过正交实验考察了ICP仪器工作参数,结果表明最佳测定条件为射频功率1.3kW,雾化器流量0.70 L/min,试样提升量2.00 mL/min,辅助气流量0.20 L/min,等离子体流量15 L/min。方法检出限为0.0002~0.006 mg/L,回收率为93.60%~101.34%,相对标准偏差均小于4.45%。此法简便、快速、灵敏度高、准确性好、对环境污染小,可多元素同时测定。 相似文献
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Yeuk T. Lau Ka M. Ng Na Chen David T. W. Lau Kam M. Ko Ping C. Leung Christianto Wibowo 《American Institute of Chemical Engineers》2014,60(12):4014-4026
A quality assurance (QA) procedure for multiple‐herb extraction, which takes into account the existence of common chemical markers and multiple‐herb‐extraction effects, has been developed for producing Chinese herbal medicines (CHMs) of consistent quality. The experimental method for determining related correlation function of the multiple‐herb‐extraction effect was designed. A systematic solution strategy was also developed to appropriately decompose the multiple‐herb extraction system into several subsystems for obtaining solution(s) and determining the overall behavior of the system. An example of QA of Danshen–Gegen (DG) decoction was used to demonstrate the QA procedure. An H9c2 cell assay was used to test the efficacy of consistent quality DG decoctions prepared by different herb combinations with different material costs of herbs. It was observed that a multiple‐herb‐extraction effect was present in the aqueous extraction of Danshensu and this effect was depended on the extraction solvent. The possible mechanism of this multiple‐herb‐extraction effect in the aqueous DG extraction was speculated to be the change of initial pH value of the aqueous extraction solvent by an unknown component from Gegen. The experimental chemical marker concentrations fell within ±10% of the specified chemical marker compositions by using the amount of herb from each herb class as predicted by the QA model. Furthermore, an H9c2 cell assay was used to test the efficacy of three consistent quality DG extracts, which were produced by different herb combinations with different material costs of herbs. The results showed that the three DG extracts provided consistent biological efficacy against menadione‐induced toxicity. This study extended a recently developed QA procedure of single‐herb extraction to multiple‐herb extraction. It provides a solution of QA in extraction, which is one of the most important unresolved problems in the modernization of traditional Chinese medicines. With this modified model and the companion experiments, the amount of herbs needed from different quality classes to produce a multiple‐herb formula CHM product decoction with consistent quality can be exactly determined. © 2014 American Institute of Chemical Engineers AIChE J 60: 4014–4026, 2014 相似文献
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应用微波消解进行样品前处理,电感耦合等离子体质谱法测定湿基草莓中的15种微量稀土元素。试验结果表明,该方法相关系数(r)在0.999 5~1.000 0之间,方法回收率在94.2%~106.4%之间,方法精密度(RSD%)低于6.92%。该方法具有前处理过程简单、引入干扰少、准确度、精密度、检出限满足要求,同时具有线性范围广、测试速度快等特点,适合湿基草莓样品中微量稀土元素的测定。 相似文献
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In order to address the problems existing in the traditional production techniques for sodium dichromate, a new green technology for producing sodium dichromate using an electrochemical synthesis method was studied. Using a self‐made electrosynthesis reactor composed of pure titanium and stainless steel, with a multiple‐unit metal oxide combination anode, a stainless steel cathode, and a reinforcing combination cation exchange membrane, the kinetic experiments were carried out on the direct electrochemical synthesis reaction of sodium dichromate from sodium chromate. The kinetic data were experimentally measured at different temperatures and different initial sodium chromate concentrations of anolyte. The results show that the electrochemical synthesis process presents complicated zero‐order reaction kinetic characteristics, with the reaction rate constant depending on the initial sodium chromate concentration. The macrokinetic equation of the electrochemical synthesis reaction was established, and some kinetic parameters were calculated. The apparent activation energy is less than that of the ordinary chemical reaction, and this shows that the electrochemical synthesis of sodium dichromate has great development potential. 相似文献
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腐植酸钠用作粉焦成型粘结剂的研究 总被引:1,自引:0,他引:1
本文介绍了从风化煤中提取腐植酸钠作粘结剂用于直立炉粉焦成型制气。对不同配比的焦球作了各种强度指标的测定,结果表明当腐植酸钠的配入量达7%时,焦球的各项强度指标均较高。 相似文献
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分光光度法同时测定采矿废水中的Fe2+、Cu2+、Zn2+ 总被引:1,自引:0,他引:1
采用多元线性回归分光光度法测定某采矿废水中Fe2+、Cu2+、Zn2+,首先配制不同浓度的Fe2+、Cu2+、Zn2+三组分混合溶液,在混合液各组分最佳优化条件下测定其吸光度.用Excel软件对所测数值进行分析,得到了多元线性方程.检测自制水样并求解多元方程,将计算结果与已知浓度作比较,相对误差<10%.该方法回收率为98.0%~103.0%,RSD为0.61%~2.27%.可对互为干扰的Fe2+、Cu2+、Zn2+同时测定. 相似文献
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