I-DPD spectrophotometry yindlela eqhelekileyo yokubona intsalela yeklorin ekhululekileyo kunye neklorin eshiyekileyo iyonke kumgangatho wesizwe waseTshayina "Isigama soMgangatho waManzi kunye neendlela zokuhlalutya" GB11898-89, iphuhliswe ngokudibeneyo nguMbutho wezeMpilo woLuntu waseMelika, iAmerican Water Works Association kunye noLawulo loNgcoliseko lwaManzi. Federation. Kwi-"Standard Test Methods for Water and Waste" ehleliweyo, indlela yeDPD iye yaphuhliswa ukususela kwi-15th edition kwaye iyanconywa njengendlela eqhelekileyo yokuvavanya i-chlorine dioxide.
Izinto ezilungileyo zendlela yeDPD
Iyakwazi ukwahlula i-chlorine dioksidi kwiintlobo ezahlukeneyo zeklorini (kubandakanya i-chlorine eshiyekileyo yamahhala, i-chlorine eshiyekileyo kunye nekloriyithi, njl. njl.), okwenza kube lula ukwenza iimvavanyo ze-colorimetric. Le ndlela ayichanekanga njenge-amperometric titration, kodwa iziphumo zanele kwiinjongo ezininzi eziqhelekileyo.
umgaqo
Ngaphantsi kweemeko ze-pH 6.2 ~ 6.5, i-ClO2 iqala ukusabela kunye ne-DPD ukwenza i-compound ebomvu, kodwa isixa sibonakala sifikelela kwi-fifth ye-chlorine ekhoyo (elingana nokunciphisa i-ClO2 kwi-ion chlorite). Ukuba isampuli yamanzi i-acidified phambi kwe-iodide, i-chlorite kunye ne-chlorate nayo isabela, kwaye xa ingathathi hlangothi ngokongezwa kwe-bicarbonate, umbala obangelwayo uhambelana nomxholo okhoyo we-chlorine we-ClO2. Ukuphazamiseka kweklorini yamahhala kunokuvinjelwa ngokongeza i-glycine. Isiseko kukuba i-glycine inokuguqula ngokukhawuleza i-chlorine yamahhala kwi-chlorinated aminoacetic acid, kodwa ayinayo impembelelo kwi-ClO2.
Isisombululo esiqhelekileyo sesitokisi se-potassium iodate, i-1.006g / L: Ubunzima be-1.003g iodate ye-potassium (KIO3, yomiswe kwi-120 ~ 140 ° C kwiiyure ze-2), ichithekile emanzini ahlambulukileyo, kwaye idluliselwe kwi-1000ml umthamo.
Nciphisa i-flask yokulinganisa kwi-mark kwaye udibanise.
Isisombululo esiqhelekileyo se-potassium iodate, i-10.06mg / L: Thatha i-10.0ml yesisombululo sesitokisi (4.1) kwi-flask ye-volumetric ye-1000ml, yongeza malunga ne-1g ye-iodide ye-potassium (4.5), yongeza amanzi ukuze uhlambulule uphawu, kwaye udibanise. Lungiselela ngomhla wokusetyenziswa kwibhotile emdaka. I-1.00ml yesi sisombululo sisemgangathweni sine-10.06μg KIO3, elingana ne-1.00mg / L ekhoyo yeklorini.
Isithinteli sePhosphate: Nyibilikisa i-24g anhydrous disodium hydrogen phosphate kunye ne-46g anhydrous potassium dihydrogen phosphate kumanzi adiyiliweyo, uze emva koko udibanise kwi-100ml yamanzi adibeneyo kunye ne-800mg EDTA yetyuwa ye-disodium enyibilikisiweyo. Nciphisa ngamanzi adibeneyo kwi-1L, ngokuzikhethela ukongeza i-20mg ye-mercuric chloride okanye i-2 yehla ye-toluene ukukhusela ukukhula kwesikhunta. Ukongeza i-20 mg ye-mercuric chloride inokuphelisa ukuphazamiseka kwemilinganiselo ye-iodide enokuthi ihlale xa ilinganisa i-chlorine yamahhala. (Qaphela: I-Mercury chloride inetyhefu, yiphathe ngononophelo kwaye ugweme ukuginya)
I-N, N-diethyl-p-phenylenediamine (DPD) Isalathisi: Dissolve 1.5g DPD sulfate pentahydrate okanye 1.1g anhydrous DPD sulfate kumanzi ane-chlorine-free distilled aqukethe i-8ml1 + 3 sulfuric acid kunye ne-200mg EDTA disodium ityuwa 1, nciphisa kwibhotile yeglasi yomhlaba omdaka, kwaye ugcine kwindawo emnyama. Xa isalathisi siphela, kufuneka sihlaziywe kwakhona. Qwalasela ixabiso lokufunxa kwiisampuli ezingenanto,
Ukuba ixabiso le-absorbsor ye-blank kwi-515nm lidlula i-0.002 / cm, ukubuyiswa kwakhona kufuneka kushiywe.
I-iodide ye-potassium (ikristale ye-KI)
Isisombululo se-sodium arsenite: Dissolve 5.0g NaAsO2 emanzini adibeneyo kwaye uhlambulule kwi-1 ilitha. Qaphela: I-NaAsO2 inetyhefu, kunqande ukungeniswa!
Isisombululo se-Thioacetamide: Chitha i-125 mg ye-thioacetamide kwi-100 ml yamanzi adibeneyo.
Isisombululo seGlycine: Dissolve 20g glycine emanzini angenayo i-chlorine kwaye uhlambulule kwi-100ml. Gcina umkhenkce. Kufuneka kuhlaziywe kwakhona xa kusenzeka i-turbidity.
Isisombululo se-Sulfuric acid (malunga ne-1mol / L): Chitha i-5.4ml egxininiswe i-H2SO4 kwi-100ml yamanzi adibeneyo.
Isisombululo se-sodium hydroxide (malunga ne-2mol / L): Ubunzima be-8g NaOH kwaye uyinyibilikise kwi-100ml yamanzi acocekileyo.
Ulungelelwaniso (ukusebenza) ijika
Kuluhlu lweetyhubhu zemibala engama-50, yongeza i-0.0, 0.25, 0.50, 1.50, 2.50, 3.75, 5.00, 10.00ml yesisombululo esiqhelekileyo se-potassium iodate, ngokulandelanayo, yongeza malunga ne-1g ye-potassium iodide kunye ne-0.5ml yesisombululo se-asidi ye-asidi yima imizuzu emi-2, uze udibanise i-0.5ml isisombululo se-sodium hydroxide kwaye uhlambulule uphawu. Ugxininiso kwibhotile nganye ngokulandelanayo lulingana ne-0.00, 0.05, 0.10, 0.30, 0.50, 0.75, 1.00, kunye ne-2.00 mg / L ye-chlorine ekhoyo. Yongeza i-2.5ml ye-phosphate buffer kunye ne-2.5ml yesisombululo sesalathisi se-DPD, xuba kakuhle, kwaye ngokukhawuleza (ngaphakathi kwemizuzu emi-2) ulinganise ukuxhamla kwi-515nm usebenzisa i-cuvette ye-intshi eyi-1. Zoba igophe elisezantsi kwaye ufumane i-regression equation.
Amanyathelo okuzimisela
I-Chlorine dioxide: Yongeza i-1ml yesisombululo se-glycine kwi-50ml yesampuli yamanzi kwaye udibanise, uze udibanise i-2.5ml ye-phosphate buffer kunye ne-2.5ml yesisombululo sesalathisi se-DPD, xuba kakuhle, kwaye ulinganise i-absorption ngokukhawuleza (ngaphakathi kwemizuzu emi-2) (ukufunda yi-G).
I-Chlorine dioxide kunye ne-chlorine ekhoyo yamahhala: Thatha enye isampuli yamanzi e-50ml, yongeza i-2.5ml phosphate buffer kunye ne-2.5ml yesisombululo sesalathisi se-DPD, xuba kakuhle, kwaye ulinganise i-absorbence ngokukhawuleza (ngaphakathi kwemizuzu emi-2) (ukufundwa ngu-A).
7.3 I-chlorine dioxide, i-chlorine ekhoyo yamahhala kunye ne-chlorine ekhoyo edibeneyo: Thatha enye i-50ml yesampuli yamanzi, yongeza malunga ne-1g ye-iodide ye-potassium, yongeza i-2.5ml ye-phosphate buffer kunye ne-2.5ml yesisombululo sesalathisi se-DPD, xuba kakuhle, kwaye ulinganise ukufunxa ngokukhawuleza (ngaphakathi Imizuzu emi-2) (Ukufunda nguC).
I-chlorine ekhoyo iyonke kubandakanywa i-chlorine dioxide yamahhala, i-chlorine, i-chlorine eshiyekileyo yamahhala kunye ne-chlorine eyintsalela edibeneyo: Emva kokufumana i-C yokufunda, yongeza isisombululo se-0.5ml ye-sulfuric acid kwisampuli yamanzi kwibhotile yombala ofanayo, kwaye udibanise Emva kokuma ngxi imizuzu emi-2, yongeza. I-0.5 ml isisombululo se-sodium hydroxide, xuba kwaye ulinganise ukuxhamla ngokukhawuleza (ukufunda nguD).
ClO2=1.9G (ibalwe njengeClO2)
Ifumaneka simahla iklorine=AG
Idibaniswe iklorine ekhoyo = CA
Iyonke iklorine ekhoyo=D
I-Chlorite=D-(C+4G)
Iziphumo zeManganese: Eyona nto ibalulekileyo ephazamisayo ekufunyanwa kumanzi okusela yimanganese oxide. Emva kokufaka i-phosphate buffer (4.3), yongeza i-0.5 ~ 1.0ml isisombululo se-sodium arsenite (4.6), uze ungeze isalathisi se-DPD ukulinganisa ukuxhamla. Thabatha olu fundo kufundo A ukususa
Susa uphazamiseko kwi-manganese oxide.
Impembelelo yeqondo lokushisa: Kuzo zonke iindlela zangoku zokuhlalutya ezinokuhlula i-ClO2, i-chlorine yamahhala kunye ne-chlorine edibeneyo, kubandakanywa ne-amperometric titration, indlela eqhubekayo ye-iodometric, njl., ukushisa kuya kuchaphazela ukuchaneka kokuhlukana. Xa ubushushu buphezulu, i-chlorine edibeneyo (i-chloramine) iya kukhuthazwa ukuba ithathe inxaxheba ekuphenduleni kwangaphambili, okukhokelela kwiziphumo eziphezulu ze-ClO2, ngakumbi i-chlorine yamahhala. Indlela yokuqala yokulawula kukulawula ubushushu. Ngama-20 ° C, unokongeza i-DPD kwisampuli yamanzi kwaye uyixube, kwaye ngoko nangoko wongeze isisombululo se-0.5ml se-thioacetamide (4.7) ukumisa i-chlorine eseleyo edibeneyo (i-chloramine) esuka kwi-DPD. Ukusabela.
Impembelelo yexesha le-colorimetric: Ngakolunye uhlangothi, umbala obomvu oveliswa yi-ClO2 kunye ne-DPD isalathisi ayizinzile. Umbala omnyama, ngokukhawuleza uphela. Ngakolunye uhlangothi, njengoko isisombululo se-phosphate buffer kunye nesalathisi se-DPD sixutywa ngokuhamba kwexesha, nabo baya kutshabalala. Ivelisa umbala obomvu obuxoki, kwaye amava abonise ukuba oku kuxhomekeke kwixesha lokungazinzi kombala yimbangela enkulu yokunciphisa ukuchaneka kwedatha. Ngoko ke, ukukhawulezisa inyathelo ngalinye lokusebenza ngelixa ulawula ukulungelelaniswa kwexesha elisetyenziswe kwinqanaba ngalinye kubalulekile ekuphuculeni ukuchaneka. Ngokwamava: ukukhula kombala kugxininiso olungaphantsi kwe-0.5 mg/L lunokuzinza malunga nemizuzu eyi-10 ukuya kwengama-20, ukukhula kombala kugxininiso olumalunga ne-2.0 mg/L lunozinza kuphela malunga nemizuzu emi-3 ukuya kwemi-5, kwaye ukuphuhliswa kombala kwinqanaba elingaphezulu kwe-5.0 mg / L liya kuzinza ngaphantsi kwe-1 iminithi.
ILH-P3CLOokwangoku ebonelelwe yi Lianhua yinto ephathekayoimitha yeklorini eseleyoehambelana nendlela yefotometric yeDPD.
I-analyzer sele isethe ubude be-waveleng kunye ne-curve. Udinga kuphela ukongeza ii-reagents kwaye wenze i-colorimetry ngokukhawuleza ukufumana iziphumo ze-chlorine eshiyekileyo, i-chlorine eshiyekileyo kunye ne-chlorine dioxide emanzini. Ikwaxhasa unikezelo lwamandla ebhetri kunye nombane wangaphakathi, okwenza kube lula ukuwusebenzisa ngaphandle okanye kwilabhoratri.
Ixesha lokuposa: May-24-2024
