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).

百纵科技(1399元/月)香港CN2站群232IP

湖南百纵科技有限公司是一家具有ISP ICP 电信增值许可证的正规公司,多年不断转型探索现已颇具规模,公司成立于2009年 通过多年经营积累目前已独具一格,公司主要经营有国内高防服务器,香港服务器,美国服务器,站群服务器,东南亚服务器租用,国内香港美国云服务器,以及全球专线业务!活动方案:主营:1、美国CN2云服务器,美国VPS,美国高防云主机,美国独立服务器,美国站群服务器,美国母机。2、香港C...

HoRain Cloud:国内特价物理机服务器,镇江机房,内地5线BGP接入,月付499元起

horain怎么样?horain cloud是一家2019年成立的国人主机商家,隶属于北京辰帆科技有限公司,horain持有增值电信业务经营许可证(B1-20203595),与中国电信天翼云、腾讯云、华为云、UCloud、AWS等签署渠道合作协议,主要提企业和个人提供云服务器,目前商家推出了几款特价物理机,都是在内地,性价比不错,其中有目前性能比较强悍的AMD+NVMe系列。点击进入:horain...

€4.99/月Contabo云服务器,美国高性价比VPS/4核8G内存200G SSD存储

Contabo是一家运营了20多年的欧洲老牌主机商,之前主要是运营德国数据中心,Contabo在今年4月份增设新加坡数据中心,近期同时新增了美国纽约和西雅图数据中心。全球布局基本完成,目前可选的数据中心包括:德国本土、美国东部(纽约)、美国西部(西雅图)、美国中部(圣路易斯)和亚洲的新加坡数据中心。Contabo的之前国外主机测评网站有多次介绍,他们家的特点就是性价比高,而且这个高不是一般的高,是...

003hh.com为你推荐
access数据库什么是ACCESS数据库同ip站点查询如何查看几个站是不是同IP百度关键词工具如何利用百度关键词推荐工具选取关键词www.gegeshe.com《我的电台fm》 she网址是多少?百度指数词百度指数是指,词不管通过什么样的搜索引擎进行搜索,都会被算成百度指数吗?www.789.com.cn有什么网站可以玩游戏的.www.henhenlu.com有一个两位数,十位数字是个位数字的二分之一,将十位数字与个位数字对调,新的两位数比原来大36,这个两位数www.cn12365.org全国公民身份证号码查询服务中心(http://www.nciic.com.cn/)这个网站怎么查不了啊?月风随笔赏月之后的情感?语文随笔200-400字月风随笔散文校园月色600字初中作文
韩国vps俄罗斯美女 代理域名备案 日本软银 免费主机 国外bt 轻博 天互数据 美国独立日 申请网站 申请免费空间 cdn网站加速 国外网页代理 广州服务器托管 rewritecond 香港博客 认证机构 weblogic部署 asp.net虚拟主机 网络安装 更多