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
NameSilo域名优惠码活动
NameSilo是通过之前的感恩节优惠活动中认识到这家注册商的，于是今天早上花了点时间专门了解了NameSilo优惠码和商家的详细信息。该商家只销售域名，他们家的域名销售价格还是中规中矩的，没有像godaddy域名标价和使用优惠之后的价格悬殊很大，而且其特色就是该域名平台提供免费的域名停放、免费隐私保护等功能。namesilo新注册域名价格列表，NameSilo官方网站：www.namesilo....
Gigsgigscloud（$9.8）联通用户优选日本软银VPS
gigsgigsCloud日本东京软银VPS的大带宽配置有100Mbps、150Mbps和200Mbps三种，三网都走软银直连，售价最低9.8美元/月、年付98美元。gigsgigscloud带宽较大延迟低，联通用户的好选择!Gigsgigscloud 日本软银(BBTEC, SoftBank)线路，在速度/延迟/价格方面，是目前联通用户海外VPS的最佳选择，与美国VPS想比，日本软银VPS延迟更...
HostYun（25元）俄罗斯CN2广播IP地址
从介绍看啊，新增的HostYun 俄罗斯机房采用的是双向CN2线路，其他的像香港和日本机房，均为国内直连线路，访问质量不错。HostYun商家通用九折优惠码：HostYun内存CPUSSD流量带宽价格（原价）购买地址1G1核10G300G/月200M28元/月购买链接1G1核10G500G/月200M38元/月购买链接1G1核20G900G/月200M68元/月购买链接2G1核30G1500G/月...
003hh.com为你推荐
-
固态硬盘是什么固态硬盘是什么？与普通硬盘有什么区别？移动硬盘与u盘有什么区别？摩拜超15分钟加钱怎么领取摩拜单车免费卷摩根币摩根币是传销吗摩根币摩根币是怎么骗人的？对对塔今儿老师给推荐了一个叫对对塔的学习网站，看起来挺不错的，有用过的人吗？管不管用？哪些功能比较好啊？嘉兴商标注册我想注册个商标怎么注册啊？seo优化工具seo优化软件有哪些？www.119mm.comwww.993mm+com精品集！haole16.com高手们帮我看看我的新网站WWW.16mngt.com怎么不被收录啊？www.7788dy.comwww.tom365.com这个免费的电影网站有毒吗?