cm003hh.com
003hh.com 时间:2021-04-07 阅读:()
Determinationofmercurylevelsinenvironmentalsamplesusing2-acetylfuranisonicotinoylhydrazonebyspectrophotometricmethodFullPaperINTRODUCTIONTheanalyticalmonitoringofmercuryinenvironmen-tal,biological,industrialandfoodsamplesisextremelyimportantbecauseofthehightoxicityofthismetalbothinitsinorganicandorganiccompounds[1].
Anexampleforacutemercurypoisoningis"Mina-matadiseases"whichcausesmentaldisturbance,alossofbalance,speech,sightandhearing,difficultyinswallowingandfinallycomaanddeath[2].
Thetoxicityofmercuryde-pendsonitschemicalnature.
Inorganicmercuryhasaveryhighaffinityforproteinsulf-hydrylgroups,accu-mulatesinkidneys,whereasorganicmercuryismoreV.
SaleemBasha1,S.
VidyasagarBabu2,G.
Narasimha3,K.
HussainReddy2*1GovernmentDegreeCollege(Men),Anantapur,A.
P,(INDIA)2DepartmentofChemistry,SriKrishnadevarayaUniversity,Anantapur–515003.
A.
P,(INDIA)3AppliedMicrobiologylaboratory,DepartmentofVirology,SriVenkateswaraUniversity,Tirupati-517502AndhraPradesh,(INDIA)E-mail:khussainreddy@yahoo.
co.
in.
comtoxicsinceitissolubleinfat,thelipidfractionsofmem-branes,andbraintissue.
Mercurytoxicityiscausedmainlybythefactthatitentersthelivingorganismandreactswithdifferentenzymesinhibitingthecatalysisofbasicmetabolicreactions[3].
Theabilityoflivingorgan-ismstoconvertinorganicmercurytoorganicmercurycompoundswhicharemoretoxicandaccumulatetoagreaterextentinsensitivetissues,isalsoaconsiderablefact.
Themainsourcesofmercuryfromwhichitaccu-mulatesintheenvironmentaresyntheticadhesives,airconditionerfilters,amalgams,autoexhausts,anatomicpreservatives,antifoulingpaints,dentalamalgams,bat-teries,cathodetubes,bloodbanksaline,cinnabaretc.
KEYWORDSBiological;Soil;Environmentalsamples;Mercury(II);Substitutedhydrazones;Spectrophotometry.
ABSTRACT2-acetylfuranisonicotinoylhydrazone(AFINH)hasbeensynthesizedandproposedasanewchromogenicreagentforarapid,simple,selective,directandnon-extractivespectrophotometricmethodisdevelopedforthedeterminationofmercury(II)inaqueousdimethylformamide(DMF).
Thereagentgivesdeepyellowcoloured,1:1(M:L)complexwithmercury(II)insodiumacetate-aceticacidbuffermediumofpH5.
5atmax365nm.
Thecolourreactionisinstantaneousandtheabsorbanceremainsconstantforabout12hrs.
Themolarabsorptivityofmercurycomplexis2.
3x103Lmol-1cm-1andsandell'ssensitivityarefoundtobe0.
0888gcm-2.
Themethodwassuccessfullyappliedtoanumberofenvironmental,biologicalandsoilsamples.
Theresultswerecomparablewiththoseobtainedbydithizonemethod.
Theproposedsystemproducedsatisfactoryresultsforthedeter-minationofHg(II).
Theresultsarequiteencouragingandcanbringaware-nessamongthepublic.
2013TradeScienceInc.
-INDIAACAIJ,13(3)2013[81-85]AnIndianJournalVolume13Issue3AnalyticalCHEMISTRYAnalyticalCHEMISTRYISSN:0974-7419.
82Determinationofmercurylevelsinenvironmentalsamplesusing2-acetylfuranFullPaperACAIJ,13(3)2013K.
HussainReddyetal.
83FullPaperACAIJ,13(3)2013AnIndianJournalAnalyticalCHEMISTRYAnalyticalCHEMISTRYDeterminationofmercury(II)Mercury(II)reactswithAFINHinacidicpH(5.
5)togivecolouredcomplexes.
Thecolourreactionisin-stantaneousevenatroomtemperature.
Theorderofadditionofreagent,metalion,buffer,2.
5mlofDMF.
Theabsorbanceofthecolouredcomplexremainscon-stantformorethan2hours.
A10-foldmolarexcessofthereagentisadequateforfullcolourdevelopment.
Ad-ditionofexcessofreagenthasnoadverseeffectontheabsorbanceofthecomplexes.
ThesystemobeysBeer'slawintheconcentrationrange3.
21-32.
1g/mlofmer-cury.
ThemolarabsorptivityandSandell'ssensitivityofthemethodsforHg(II)arefoundtobe0.
41x104Lmol-1cm-1and0.
0875g/cm2respectively.
Thespe-cificabsorptivityofthesystemis0.
01142ml/g-1cm-1Hg(II).
Therelativestandarddeviationfortenrepli-cateanalysisofHg(II)is0.
082percent.
Job'sandMolarratiomethodsgavethecompositionoftheHg(II)complexesas1:2(M:L).
thestabilityconstantsofHg(II)complexcalculatedbyJob'smethodisfoundtobe1.
5x1010.
Determinationofmercuryinvariouswater,soilandbiologicalsamplesThepresentmethodisappliedfordeterminationofmercuryin(i)Watersamples,(ii)Soilsamples,and(iii)Biologicalsamples.
Watersamples[4,9]Eachfiltered(withwhattmanNo.
40)watersample[4,9](250ml)wasmixedwith10mlofconcen-tratednitricacidina500mldistillationflask.
Thesamplewasdigestedinthepresenceofanexcesspotassiumpermanganatesolutionaccordingtothemethodrec-ommendedbyFifieldetal[5].
ThesolutionwascooledandneutralizedwithdiluteNH4OHsolution.
Thedigestwastransferredintoa25-mlcalibratedflaskanddi-luteduptothemarkwithdeionizedwater.
TheresultsweregiveninTABLE2.
Soilssamples[5,9]andBiologicalsamples[6,9]Driedfishsamples[6,9]andvarioussoil[5,9]samples2-5gramsweretakenina250mlbeaker.
A6mlofconcentratednitricacidwasaddedandgentlyheatedforhalf-an-hour.
Afterthedisappearanceofthefroth,6mlof1:1nitricacidandperchloricacidwereadded[8-9].
Thecontentsweredigestedfor1hourandrepeatedlytreatedwith6mlportionsofnitricacidandpercholoricacidmixtureuntilthesolutionbecomescolourless.
Theacidicsolutionwasevaporatedtodrynessandthere-sultingwhiteresiduewasdissolvedinminimumvolumeproton,-NH(imino)groupsofhydrazonerespectively.
MassspectrumofAFINHshowsmolecularionpeakatm/z252correspondingtothemolecularionpeakassociatedwithNa(Basepeak).
Otherpeaksduetolossofmethylradicalandfuranylradicalarealsoobservedinmassspectrum.
ThepKavaluesofAFINHThepKavaluesofAFINHweredeterminedbyrecordingtheUV-Visiblespectraofmicromolar(4x10-6M)solutionofthereagentatvariouspHvaluesandbytakingthearithmeticmeansofthevaluesob-tainedfromthemeasurementsatdifferentwavelengthsdeterminedspectrophotometricallyusingPhillipandMerrittmethod[7].
ThevaluesofdeprotonationofAFINHare3.
6(pK1)and6.
3(pK2)correspondingtotheformationofenolformandconjugatedmonoanionformrespectively.
RESULTSANDDISCUSSIONThereagent2-acetylfuranisonicotinoylhydrazoneiseasilypreparedunderrefluxconditions.
A0.
001MsolutionofAFINHisstableformorethantwohours.
Inbuffermedium(pH5.
5),theligandpresumablyex-istsinenolicformandcoordinatesthedivalentmetalionasmonoanion.
Thereagentgivesintensecolourreactiononlywithmercuryandshowmaximumabsor-banceat355nm.
Thereagent(AFINH)isconsideredaspotentialreagentforselectivespectrophotometricdeterminationofmercury(II).
XCCH3NNHCONX=OFigure1:StructureofAFINH.
84Determinationofmercurylevelsinenvironmentalsamplesusing2-acetylfuranFullPaperACAIJ,13(3)2013K.
HussainReddyetal.
85FullPaperACAIJ,13(3)2013AnIndianJournalAnalyticalCHEMISTRYAnalyticalCHEMISTRYThepresentmethod(AFINH)wasappliedforthedeterminationofHg(II)whenpresentaloneandpresentinwater,biologicalandsoilsamplesandresultswerecomparedwithdithizonemethod[10].
APPLICATIONSMercurywasestimatedinvariouswatersamples,biologicalandsoilsamplesbyemployingthepresentmethod.
TheresultsarepresentedinTABLE2CONCLUSIONSThepresentstudyclearlyindicatesthatthemer-curycontentcanbedeterminedinultratracelevelinwater,biologicalandsoilsamplesusingpresentmethod.
Allthesefindingscausegreatconcernregardingpublichealthdemandinganaccuratedeterminationofthismetalionanditmayprovideawarenessamongthepublic.
TABLE3:DeterminationofmercuryinsoilsamplesAmountofmercuryafound(g/ml)NameofthesamplesAFINHmethodDithizonemethodUrbansoil0.
980.
98Agriculturalsoil0.
450.
41Roadsidesoil1.
681.
62aAverageofthreedeterminations.
TABLE4:DeterminationofmercuryinbiologicalsamplesAmountofmercuryafound(g/mlofdriedliver)LiversamplesAINHHmethodDithizonemethodFishliver1.
280.
84Sheepliver0.
830.
86aAverageoffivedeterminationsACKNOWLEDGEMENTTheAuthorSaleemisgratefultoUGCSEROHyderabadForthefinancialassistance,AuthoralsothankDrB.
VSubbaReddyIICTHyderabadandDr.
A.
RathanPrasad,Scientists,forprovidingIR,NMRandMassspectraldata.
REFERENCES[1]M.
HumairaKhan,JamaluddineAhmed;AnalyticalScience,21,507-512(2005).
[2]A.
I.
Vogel;ATextBookofQuantitativeInorganicAnalysis,3rdEdition;ELBSandLongman,325(1975).
[3]G.
Pavlogeorgaters,V.
Kikilias;GlobaNest,Int.
J.
,4(2-3),107-125(2002).
[4]S.
Hamads,S.
Motomizu,K.
Toei;Analyst,113,945-948(1988).
[5]D.
D.
Ferrin,D.
Boyd;BuffersforpHandmetaloncontrol,ChapmanandHall,London,9,128(1974).
[6]F.
W.
Fifield,P.
J.
Haines,(Eds);EnvironmentalAna-lyticalChemistry,BlackwellScience,378(2000).
[7]M.
Kamburova;Talanta,40(5),719-723(1993).
[8]K.
HussainReddy;Ph.
D.
thesis,S.
K.
University,(1983).
[9]KazumiInagakietal.
;TheAnalyst,125,191-196(2000).
[10]F.
D.
Snell,C.
T.
Snell;Colorimetricmethodsofanaly-sis,3rdEdition,11,92(1949).
[11]Z.
Marczenko;Spectrophotometricdeterminationofelements,Wiley,NewYork,241,351,602(1976).
[12]K.
B.
Chandrasekhar,K.
HussainReddy;Indian.
J.
Ch-em.
Sect.
A.
,40,727(2001).
Anexampleforacutemercurypoisoningis"Mina-matadiseases"whichcausesmentaldisturbance,alossofbalance,speech,sightandhearing,difficultyinswallowingandfinallycomaanddeath[2].
Thetoxicityofmercuryde-pendsonitschemicalnature.
Inorganicmercuryhasaveryhighaffinityforproteinsulf-hydrylgroups,accu-mulatesinkidneys,whereasorganicmercuryismoreV.
SaleemBasha1,S.
VidyasagarBabu2,G.
Narasimha3,K.
HussainReddy2*1GovernmentDegreeCollege(Men),Anantapur,A.
P,(INDIA)2DepartmentofChemistry,SriKrishnadevarayaUniversity,Anantapur–515003.
A.
P,(INDIA)3AppliedMicrobiologylaboratory,DepartmentofVirology,SriVenkateswaraUniversity,Tirupati-517502AndhraPradesh,(INDIA)E-mail:khussainreddy@yahoo.
co.
in.
comtoxicsinceitissolubleinfat,thelipidfractionsofmem-branes,andbraintissue.
Mercurytoxicityiscausedmainlybythefactthatitentersthelivingorganismandreactswithdifferentenzymesinhibitingthecatalysisofbasicmetabolicreactions[3].
Theabilityoflivingorgan-ismstoconvertinorganicmercurytoorganicmercurycompoundswhicharemoretoxicandaccumulatetoagreaterextentinsensitivetissues,isalsoaconsiderablefact.
Themainsourcesofmercuryfromwhichitaccu-mulatesintheenvironmentaresyntheticadhesives,airconditionerfilters,amalgams,autoexhausts,anatomicpreservatives,antifoulingpaints,dentalamalgams,bat-teries,cathodetubes,bloodbanksaline,cinnabaretc.
KEYWORDSBiological;Soil;Environmentalsamples;Mercury(II);Substitutedhydrazones;Spectrophotometry.
ABSTRACT2-acetylfuranisonicotinoylhydrazone(AFINH)hasbeensynthesizedandproposedasanewchromogenicreagentforarapid,simple,selective,directandnon-extractivespectrophotometricmethodisdevelopedforthedeterminationofmercury(II)inaqueousdimethylformamide(DMF).
Thereagentgivesdeepyellowcoloured,1:1(M:L)complexwithmercury(II)insodiumacetate-aceticacidbuffermediumofpH5.
5atmax365nm.
Thecolourreactionisinstantaneousandtheabsorbanceremainsconstantforabout12hrs.
Themolarabsorptivityofmercurycomplexis2.
3x103Lmol-1cm-1andsandell'ssensitivityarefoundtobe0.
0888gcm-2.
Themethodwassuccessfullyappliedtoanumberofenvironmental,biologicalandsoilsamples.
Theresultswerecomparablewiththoseobtainedbydithizonemethod.
Theproposedsystemproducedsatisfactoryresultsforthedeter-minationofHg(II).
Theresultsarequiteencouragingandcanbringaware-nessamongthepublic.
2013TradeScienceInc.
-INDIAACAIJ,13(3)2013[81-85]AnIndianJournalVolume13Issue3AnalyticalCHEMISTRYAnalyticalCHEMISTRYISSN:0974-7419.
82Determinationofmercurylevelsinenvironmentalsamplesusing2-acetylfuranFullPaperACAIJ,13(3)2013K.
HussainReddyetal.
83FullPaperACAIJ,13(3)2013AnIndianJournalAnalyticalCHEMISTRYAnalyticalCHEMISTRYDeterminationofmercury(II)Mercury(II)reactswithAFINHinacidicpH(5.
5)togivecolouredcomplexes.
Thecolourreactionisin-stantaneousevenatroomtemperature.
Theorderofadditionofreagent,metalion,buffer,2.
5mlofDMF.
Theabsorbanceofthecolouredcomplexremainscon-stantformorethan2hours.
A10-foldmolarexcessofthereagentisadequateforfullcolourdevelopment.
Ad-ditionofexcessofreagenthasnoadverseeffectontheabsorbanceofthecomplexes.
ThesystemobeysBeer'slawintheconcentrationrange3.
21-32.
1g/mlofmer-cury.
ThemolarabsorptivityandSandell'ssensitivityofthemethodsforHg(II)arefoundtobe0.
41x104Lmol-1cm-1and0.
0875g/cm2respectively.
Thespe-cificabsorptivityofthesystemis0.
01142ml/g-1cm-1Hg(II).
Therelativestandarddeviationfortenrepli-cateanalysisofHg(II)is0.
082percent.
Job'sandMolarratiomethodsgavethecompositionoftheHg(II)complexesas1:2(M:L).
thestabilityconstantsofHg(II)complexcalculatedbyJob'smethodisfoundtobe1.
5x1010.
Determinationofmercuryinvariouswater,soilandbiologicalsamplesThepresentmethodisappliedfordeterminationofmercuryin(i)Watersamples,(ii)Soilsamples,and(iii)Biologicalsamples.
Watersamples[4,9]Eachfiltered(withwhattmanNo.
40)watersample[4,9](250ml)wasmixedwith10mlofconcen-tratednitricacidina500mldistillationflask.
Thesamplewasdigestedinthepresenceofanexcesspotassiumpermanganatesolutionaccordingtothemethodrec-ommendedbyFifieldetal[5].
ThesolutionwascooledandneutralizedwithdiluteNH4OHsolution.
Thedigestwastransferredintoa25-mlcalibratedflaskanddi-luteduptothemarkwithdeionizedwater.
TheresultsweregiveninTABLE2.
Soilssamples[5,9]andBiologicalsamples[6,9]Driedfishsamples[6,9]andvarioussoil[5,9]samples2-5gramsweretakenina250mlbeaker.
A6mlofconcentratednitricacidwasaddedandgentlyheatedforhalf-an-hour.
Afterthedisappearanceofthefroth,6mlof1:1nitricacidandperchloricacidwereadded[8-9].
Thecontentsweredigestedfor1hourandrepeatedlytreatedwith6mlportionsofnitricacidandpercholoricacidmixtureuntilthesolutionbecomescolourless.
Theacidicsolutionwasevaporatedtodrynessandthere-sultingwhiteresiduewasdissolvedinminimumvolumeproton,-NH(imino)groupsofhydrazonerespectively.
MassspectrumofAFINHshowsmolecularionpeakatm/z252correspondingtothemolecularionpeakassociatedwithNa(Basepeak).
Otherpeaksduetolossofmethylradicalandfuranylradicalarealsoobservedinmassspectrum.
ThepKavaluesofAFINHThepKavaluesofAFINHweredeterminedbyrecordingtheUV-Visiblespectraofmicromolar(4x10-6M)solutionofthereagentatvariouspHvaluesandbytakingthearithmeticmeansofthevaluesob-tainedfromthemeasurementsatdifferentwavelengthsdeterminedspectrophotometricallyusingPhillipandMerrittmethod[7].
ThevaluesofdeprotonationofAFINHare3.
6(pK1)and6.
3(pK2)correspondingtotheformationofenolformandconjugatedmonoanionformrespectively.
RESULTSANDDISCUSSIONThereagent2-acetylfuranisonicotinoylhydrazoneiseasilypreparedunderrefluxconditions.
A0.
001MsolutionofAFINHisstableformorethantwohours.
Inbuffermedium(pH5.
5),theligandpresumablyex-istsinenolicformandcoordinatesthedivalentmetalionasmonoanion.
Thereagentgivesintensecolourreactiononlywithmercuryandshowmaximumabsor-banceat355nm.
Thereagent(AFINH)isconsideredaspotentialreagentforselectivespectrophotometricdeterminationofmercury(II).
XCCH3NNHCONX=OFigure1:StructureofAFINH.
84Determinationofmercurylevelsinenvironmentalsamplesusing2-acetylfuranFullPaperACAIJ,13(3)2013K.
HussainReddyetal.
85FullPaperACAIJ,13(3)2013AnIndianJournalAnalyticalCHEMISTRYAnalyticalCHEMISTRYThepresentmethod(AFINH)wasappliedforthedeterminationofHg(II)whenpresentaloneandpresentinwater,biologicalandsoilsamplesandresultswerecomparedwithdithizonemethod[10].
APPLICATIONSMercurywasestimatedinvariouswatersamples,biologicalandsoilsamplesbyemployingthepresentmethod.
TheresultsarepresentedinTABLE2CONCLUSIONSThepresentstudyclearlyindicatesthatthemer-curycontentcanbedeterminedinultratracelevelinwater,biologicalandsoilsamplesusingpresentmethod.
Allthesefindingscausegreatconcernregardingpublichealthdemandinganaccuratedeterminationofthismetalionanditmayprovideawarenessamongthepublic.
TABLE3:DeterminationofmercuryinsoilsamplesAmountofmercuryafound(g/ml)NameofthesamplesAFINHmethodDithizonemethodUrbansoil0.
980.
98Agriculturalsoil0.
450.
41Roadsidesoil1.
681.
62aAverageofthreedeterminations.
TABLE4:DeterminationofmercuryinbiologicalsamplesAmountofmercuryafound(g/mlofdriedliver)LiversamplesAINHHmethodDithizonemethodFishliver1.
280.
84Sheepliver0.
830.
86aAverageoffivedeterminationsACKNOWLEDGEMENTTheAuthorSaleemisgratefultoUGCSEROHyderabadForthefinancialassistance,AuthoralsothankDrB.
VSubbaReddyIICTHyderabadandDr.
A.
RathanPrasad,Scientists,forprovidingIR,NMRandMassspectraldata.
REFERENCES[1]M.
HumairaKhan,JamaluddineAhmed;AnalyticalScience,21,507-512(2005).
[2]A.
I.
Vogel;ATextBookofQuantitativeInorganicAnalysis,3rdEdition;ELBSandLongman,325(1975).
[3]G.
Pavlogeorgaters,V.
Kikilias;GlobaNest,Int.
J.
,4(2-3),107-125(2002).
[4]S.
Hamads,S.
Motomizu,K.
Toei;Analyst,113,945-948(1988).
[5]D.
D.
Ferrin,D.
Boyd;BuffersforpHandmetaloncontrol,ChapmanandHall,London,9,128(1974).
[6]F.
W.
Fifield,P.
J.
Haines,(Eds);EnvironmentalAna-lyticalChemistry,BlackwellScience,378(2000).
[7]M.
Kamburova;Talanta,40(5),719-723(1993).
[8]K.
HussainReddy;Ph.
D.
thesis,S.
K.
University,(1983).
[9]KazumiInagakietal.
;TheAnalyst,125,191-196(2000).
[10]F.
D.
Snell,C.
T.
Snell;Colorimetricmethodsofanaly-sis,3rdEdition,11,92(1949).
[11]Z.
Marczenko;Spectrophotometricdeterminationofelements,Wiley,NewYork,241,351,602(1976).
[12]K.
B.
Chandrasekhar,K.
HussainReddy;Indian.
J.
Ch-em.
Sect.
A.
,40,727(2001).
- cm003hh.com相关文档
- 展品003hh.com
- implied003hh.com
- 寄存器003hh.com
- peace003hh.com
- wait003hh.com
- Flowchart003hh.com
器安装环境和运维管理工具推荐
今天看到一个网友从原来虚拟主机准备转移至服务器管理自己的业务。这里问到虚拟主机和服务器到底有什么不同，需要用到哪些工具软件。那准备在下班之间稍微摸鱼一下整理我们服务器安装环境和运维管理中常见需要用到的软件工具推荐。第一、系统镜像软件一般来说，我们云服务器或者独立服务器都是有自带镜像的。我们只需要选择镜像安装就可以，比如有 Windows和Linux。但是有些时候我们可能需要自定义镜像的高级玩法，这...
Friendhosting，美国迈阿密机房新上线，全场45折特价优惠，100Mbps带宽不限流量，美国/荷兰/波兰/乌兰克/瑞士等可选，7.18欧元/半年
近日Friendhosting发布了最新的消息，新上线了美国迈阿密的云产品，之前的夏季优惠活动还在进行中，全场一次性45折优惠，最高可购买半年，超过半年优惠力度就不高了，Friendhosting商家的优势就是100Mbps带宽不限流量，有需要的朋友可以尝试一下。Friendhosting怎么样？Friendhosting服务器好不好？Friendhosting服务器值不值得购买？Friendho...
10gbiz首月半价月付2.36美元，香港/洛杉矶VPS、硅谷独立服务器/站群服务器
收到10gbiz发来的7月份优惠方案，中国香港、美国洛杉矶机房VPS主机4折优惠码，优惠后洛杉矶VPS月付2.36美元起，香港VPS月付2.75美元起。这是一家2020年成立的主机商，提供的产品包括独立服务器租用和VPS主机等，数据中心在美国洛杉矶、圣何塞和中国香港。商家VPS主机基于KVM架构，支持使用PayPal或者支付宝付款。洛杉矶VPS架构CPU内存硬盘带宽系统价格单核512MB10GB1...
003hh.com为你推荐
-
openeuleropen与close的区别及用法摩根币摩根币原名【BBT】我是会员现在的我推介人把我从微信删除已经跑路，不给兑现了！请大家不要做了原代码源代码是什么意思啊嘀动网手机一键通用来干嘛呢？冯媛甑冯媛甄多大啊?长尾关键词挖掘工具外贸长尾关键词挖掘工具哪个好用www.qq530.com谁能给我一个听歌的网站？m.2828dy.comwww.dy6868.com这个电影网怎么样?www.vtigu.com初三了，为什么考试的数学题都那么难，我最多也就135，最后一道选择，填空啊根本没法做，最后几道大题倒www.javmoo.comjavimdb怎么看