英语翻译样品消解完毕,冷却,缓慢放气,取出消解罐,至160℃-查字典问答网
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来自罗亚兰的问题

  英语翻译样品消解完毕,冷却,缓慢放气,取出消解罐,至160℃电热板上彻底赶酸.用适量超纯水将消解液定容至100mL,定容液直接用于Cu、Zn、Mn、Fe的测定;定容液加入氯化镧至浓度0.5%后,稀释10倍,用

  英语翻译

  样品消解完毕,冷却,缓慢放气,取出消解罐,至160℃电热板上彻底赶酸.用适量超纯水将消解液定容至100mL,定容液直接用于Cu、Zn、Mn、Fe的测定;定容液加入氯化镧至浓度0.5%后,稀释10倍,用于Ca和Mg的测定;定容液加入氯化铯至浓度0.2%后,稀释100倍,用于K的测定.仪器工作条件见表2.

  表2仪器测定条件

  2.2.2校准曲线的绘制

  分别准确吸取一定量Fe、Zn、Cu、Mn、Ca、K、Mg等7种金属元素的标准溶液,用超纯水按比例稀释成不同的工作液,依表2选定的工作条件测定吸光度并求得吸光度与浓度关系的一元线性回

  3结果与讨论

  3.1实验结果

  3.1.12种重楼药材中7种金属元素含量的测定

  分别取2种重楼药材消解液各5份,按照2.2.1项下的仪器工作条件对其中的7种金属元素

  进行测定,计算5份平行样品液中金属元素含量的平均值,测定结果见表4.由表4可知,滇重楼和华重楼药材中的金属元素含量存在差异.其中滇重楼药材中宏量元素Ca、Mg、K的含量高于华重楼;而华重楼中除了Cu的含量略低于滇重楼外,其他微量元素Fe、Zn、Mn的含量均高于滇重楼.对于宏量元素而言,滇重楼药材中Ca>K>Mg,而华重楼中K>Ca>Mg;对于微量元素而言,2种药材中金属元素的含量组成均为Fe>Zn>Mn>Cu.

  3.1.2加样回收率的测定

  为了考察方法的可靠性,在供试样品中分别加入一定量Ca、Mg、K、Fe、Zn、Cu、Mn标准物质进行回收实验,各元素的回收率测定结果见表5.滇重楼和华重楼各元素回收率在92.1%—107.5%之间,相对标准偏差(RSD)小于3%,说明本法稳定、可靠,可用于重楼药材金属元素的含量测定.

  3.2讨论

  金属元素的分析测定,其精密度和准确度在较大程度上取决于样品的处理方法,样品处理是分析测定结果是否准确的关键[11].本实验所测得的结果与已发表文献[6—8]的测定结果相比,滇重楼中各金属元素的含量均接近或超过已报道的测定结果[6,7](如实验测得Fe含量为1112.7μg/g,而王强等的测定结果为318.1μg/g),尤其是明显高于利用传统溶样法所测得的结果[6](如实验测得Ca含量为11351.1μg/g,而王强等的测定结果为5124μg/g),这可能是由于微波消解法处理样品能够进一步提高提取效率,降低样品损失率的原因.而与张金渝等[8]采用湿法硝酸-双氧水对样品进行消解处理的测定结果相比,Mg和Mn的含量略低于该文报道的测定结果,这种差异的存在是样品不同所致,还是样品处理方法差异所造成的结果,仍有待于进一步系统地研究.

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2020-09-12 01:12
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蒋韧

  Digestioniscompleted,cooling,slowlydeflated,removethedigestiontank,electricpanelto160℃completelycatchacid.Ultra-purewatertodigestionwiththeamountofliquidvolumeto100mL,theconstantvolumeliquiddirectlyforCu,Zn,Mn,Fedetermination;constantvolumeliquidaddedtoaconcentrationof0.5%lanthanumchloride,thedilutionof10timesforCaandDeterminationofMg;constantvolumetoaconcentrationofcesiumchloridesolutionbyadding0.2%,diluted100timesforKdetermination.InstrumentconditionsinTable2.

  Table2Determinationofconditionofapparatus

  2.2.2CalibrationCurve

  ImbibeacertainamountofFe,Zn,Cu,Mn,Ca,K,Mgmetalelementsof7standardsolution,dilutedwithultrapurewaterinproportiontotheworkofadifferentsolution,accordingtoTable2Determinationoftheworkingconditionsofselectedabsorptionabsorbanceandtheconcentrationdegreeandobtainedalinearrelationshipbetweenback

  3Resultsanddiscussion

  3.1Experimentalresults

  3.1.1twokindsofre-buildingof7herbsDeterminationofMetalElements

  Weretakentwokindsofre-buildingherbsdigestionsolutionof5copiesoftheinstrumentinaccordancewith2.2.1workingconditionsunderwhichthesevenkindsofmetalelements

  Weremeasuredtocalculate5wereparalleltothesampleliquidmetals,onaverage,measuredresultsinTable4.Table4shows,yunnanensisandChineseherbsinthere-buildingaredifferentmetals.OneyunnanensismacroelementsinRadixCa,Mg,Kwerehigherthanre-buildingofChina;andChinainadditiontore-flooryunnanensisCucontentslightlylowerthanoutsidethebuilding,andothertraceelementsFe,Zn,Mnlevelswerethanyunnanensis.Formacroelements,theyunnanensisRadixCa>K>Mg,there-buildinginChinaK>Ca>Mg;fortraceelements,thetwokindsofmedicinalherbsinthecompositionofthemetalcontentoftheelementswereFe>Zn>Mn>Cu.

  3.1.2Determinationofrecoveries

  Toexaminethereliabilityofthemethod,thetestedsampleswereaddedtoacertainamountofCa,Mg,K,Fe,Zn,Cu,Mnreferencematerialsforrecyclingexperiments,therecoveryoftheelementsmeasuredresultsinTable5.YunnanensisandChinare-buildingtheelementsoftherecoverybetween92.1%-107.5%,relativestandarddeviation(RSD)lessthan3%,indicatingthatthisActstable,reliable,andcanbeusedtore-floor,thedeterminationofmetalelementsinmedicine.

  3.2Discussion

  Determinationofmetalelements,theprecisionandaccuracytoalargeextentdependsonthesampleprocessing,sampleprocessingistoanalyzethekeytodeterminetheaccuracyoftheresultsof[11].Inthisstudy,themeasuredresultswiththepublishedliterature[6-8]comparedwiththemeasuredresults,yunnanensiscontentofeachmetalelementsareclosetoorexceedthemeasuredresultshavebeenreported[6,7](suchastheexperimentallymeasuredFecontentwas1112.7μg/g,andthedeterminationofsuchresultsQiang318.1μg/g),inparticular,issignificantlyhigherthanthoseusingconventionalsampledissolutionmethodmeasuretheresultsof[6](suchastheexperimentallymeasuredCacontent11351.1μg/g,andthedeterminationofsuchresultsQiang5124μg/g),whichmaybeduetosampletreatmentbymicrowavedigestionmethodtofurtherimprovetheextractionefficiency,reducesamplelossreasons.AndYuandZhan

2020-09-12 01:16:33

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