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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.
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