DPD spectrophotometry ke mokhoa o tloaelehileng oa ho bona chlorine e setseng ea mahala le chlorine e setseng ho maemo a naha a China "Vocabulary and Analytical Methods" GB11898-89, e kopantsoeng ke American Public Health Association, American Water Works Association le Taolo ea Tšilafalo ea Metsi. Federation. Ho "Mekhoa e Tloaelehileng ea Teko ea Metsi le Metsi a Litšila" e hlophisitsoeng, mokhoa oa DPD o 'nile oa ntlafatsoa ho tloha khatisong ea 15' me o khothaletsoa e le mokhoa o tloaelehileng oa ho hlahloba chlorine dioxide.
Melemo ea mokhoa oa DPD
E ka arola chlorine dioxide mefuteng e meng e fapaneng ea chlorine (ho kenyeletsoa masala a mahala a chlorine, masala a chlorine le chlorite, joalo-joalo), e etsa hore ho be bonolo ho etsa liteko tsa colorimetric. Mokhoa ona ha oa nepahala joaloka titration ea amperometric, empa liphetho li lekane bakeng sa merero e mengata e akaretsang.
molao-motheo
Tlas'a maemo a pH 6.2 ~ 6.5, ClO2 e qala ho sebetsana le DPD ho etsa motsoako o mofubelu, empa chelete e bonahala e fihla feela ho karolo ea bohlano ea kakaretso ea eona e fumanehang ea chlorine (e lekanang le ho fokotsa ClO2 ho ea ho li-ion tsa chlorite). Haeba sampole ea metsi e e-na le asiti ka boteng ba iodide, chlorite le chlorate le tsona li arabela, 'me ha li se na lehlakore ka ho eketsoa ha bicarbonate,' mala o hlahisoang o lumellana le kakaretso e fumanehang ea chlorine ea ClO2. Tšitiso ea chlorine e sa lefelloeng e ka thibeloa ka ho eketsa glycine. Motheo ke hore glycine e ka fetola hang-hang chlorine ea mahala hore e be chlorinated aminoacetic acid, empa ha e na phello ho ClO2.
Potassium iodate standard stock solution, 1.006g/L: Beha 1.003g potassium iodate (KIO3, e omisitsoeng ho 120 ~ 140 ° C bakeng sa lihora tse 2), qhibiliha ka metsing a hloekileng, 'me u fetisetsoe ho 1000ml volume.
Hlakola botlolo ea ho lekanya ho letšoao ebe u kopanya.
Tharollo e tloaelehileng ea potassium iodate, 10.06mg/L: Nka 10.0ml ea motsoako oa setoko (4.1) ka har'a 1000ml volumetric flask, eketsa hoo e ka bang 1g ea potassium iodide (4.5), eketsa metsi ho hlapolla letšoao, 'me u kopanye. Lokisetsa ka letsatsi la tšebeliso ka botlolo e sootho. 1.00ml ea tharollo ena e tloaelehileng e na le 10.06μg KIO3, e lekanang le 1.00mg/L e fumanehang chlorine.
Phosphate buffer: Qhala 24g anhydrous disodium hydrogen phosphate le 46g anhydrous potassium dihydrogen phosphate metsing a hloekisitsoeng, ebe u kopanya le 100ml ea metsi a hloekisitsoeng le 800mg EDTA disodium letsoai le qhibilihisoa. Hlakola ka metsi a hloekisitsoeng ho 1L, ka boikhethelo eketsa 20mg mercuric chloride kapa marotholi a 2 a toluene ho thibela ho hōla ha hlobo. Ho eketsa 20 mg ea mercuric chloride ho ka felisa tšitiso ea li-iodide tse ka 'nang tsa sala ha ho lekanya chlorine ea mahala. (Tlhokomeliso: Mercury chloride e chefo, tšoara ka hloko 'me u qobe ho noa)
Pontšo ea N, N-diethyl-p-phenylenediamine (DPD): Qhala 1.5g DPD sulfate pentahydrate kapa 1.1g anhydrous DPD sulfate metsing a se nang chlorine a se nang chlorine a nang le 8ml1 + 3 sulfuric acid le 200mg EDTA disodium letsoai 1, dilute ka botlolong ea khalase ea fatše e sootho, 'me u boloke sebakeng se lefifi. Ha letšoao le fela, le hloka ho tsosolosoa. Kamehla hlahloba boleng ba ho monya lisampole tse se nang letho,
Haeba boleng ba ho monya ha letho ho 515nm bo feta 0.002 / cm, ho tsosolosoa ho hloka ho tloheloa.
Potassium iodide (KI kristale)
Tharollo ea sodium arsenite: Hlakola 5.0g NaAsO2 metsing a silafetseng 'me u hlapolle ho litara e le 1. Tlhokomeliso: NaAsO2 e chefo, qoba ho noa!
Tharollo ea Thioacetamide: Qhala 125 mg ea thioacetamide ka 100 ml ea metsi a hloekisitsoeng.
Tharollo ea Glycine: Qhala 20g glycine metsing a se nang chlorine 'me u hlapolle ho 100ml. Lebenkele le leqhoa. E hloka ho nchafatsoa ha moferefere o hlaha.
Tharollo ea sulfuric acid (hoo e ka bang 1mol/L): Qhala 5.4ml e tsitsitseng H2SO4 ka har'a 100ml ea metsi a qhibilihisitsoeng.
Tharollo ea sodium hydroxide (hoo e ka bang 2mol/L): Beha 8g NaOH ebe u e qhala ka metsi a hloekileng a 100ml.
Khalefo (ho sebetsa) curve
Ho letoto la li-tubes tse 50 tsa colorimetric, eketsa 0.0, 0.25, 0.50, 1.50, 2.50, 3.75, 5.00, 10.00ml ea tharollo e tloaelehileng ea potassium iodate, ka ho latellana, eketsa hoo e ka bang 1g ea potassium iodide le 0.5ml ea tharollo ea sulric ema metsotso e 2, ebe u eketsa 0.5ml sodium hydroxide solution 'me u hlapolle ho letšoao. Mekhahlelo ka botlolong ka 'ngoe e lekana le 0.00, 0.05, 0.10, 0.30, 0.50, 0.75, 1.00, le 2.00 mg/L ea chlorine e fumanehang. Eketsa 2.5ml ea phosphate buffer le 2.5ml ea tharollo ea DPD, kopanya hantle, 'me hang-hang (ka metsotso e 2) lekanya monyetla ho 515nm u sebelisa cuvette ea 1-inch. Etsa mokokotlo o tloaelehileng 'me u fumane equation ea regression.
Mehato ea boikemisetso
Chlorine dioxide: Eketsa 1ml ea tharollo ea glycine ho 50ml ea sampole ea metsi ebe u kopanya, ebe u eketsa 2.5ml ea phosphate buffer le 2.5ml ea tharollo ea DPD, kopanya hantle, 'me u lekanye monko hang-hang (nakong ea metsotso e 2) (ho bala ke G).
Chlorine dioxide le chlorine e fumanehang mahala: Nka metsi a mang a 50ml, eketsa 2.5ml phosphate buffer le 2.5ml DPD indicator solution, kopanya hantle, 'me u lekanye monyeho hang-hang (ka nako ea metsotso e 2) ('malo ke A).
7.3 Chlorine dioxide, chlorine e fumanehang mahala le chlorine e kopantsoeng e fumanehang: Nka 50ml e 'ngoe ea metsi, eketsa hoo e ka bang 1g ea iodide ea potasiamo, eketsa 2.5ml ea phosphate buffer le 2.5ml ea DPD indicator solution, kopanya hantle, 'me u lekanye monyetla hang-hang (ka hare ho Metsotso e 2) (Ho bala ke C).
Kakaretso ea chlorine e teng ho kenyeletsoa chlorine dioxide ea mahala, chlorite, masala a chlorine e sa lefelloeng le masala a chlorine e kopantsoeng: Kamora ho fumana palo ea C, eketsa 0.5ml 0.5ml sulfuric acid solution ho sampole ea metsi ka botlolong e tšoanang ea colorimetric, 'me u kopanye Kamora ho ema u sa sisinyehe metsotso e 2, eketsa. 0.5 ml tharollo ea sodium hydroxide, kopanya le ho lekanya monyetla hang-hang ('malo ke D).
ClO2=1.9G (e ballotsoe joalo ka ClO2)
Klorine e fumanehang mahala=AG
E kopantsoe chlorine e fumanehang = CA
Kakaretso ea chlorine e fumanehang=D
Chlorite=D-(C+4G)
Liphello tsa Manganese: Ntho ea bohlokoa ka ho fetisisa e sitisang e fumanoang metsing a nooang ke manganese oxide. Ka mor'a ho eketsa phosphate buffer (4.3), eketsa 0.5 ~ 1.0ml sodium arsenite solution (4.6), ebe u eketsa letšoao la DPD ho lekanya ho monya. Ntša 'malo ona ho tloha ho A ho felisa
Tlosa tšitiso ea manganese oxide.
Tšusumetso ea mocheso: Har'a mekhoa eohle ea hona joale ea ho hlahloba e ka khethollang ClO2, chlorine ea mahala le chlorine e kopantsoeng, ho akarelletsa le titration ea amperometric, mokhoa o tsoelang pele oa iodometric, joalo-joalo, mocheso o tla ama ho nepahala ha phapang. Ha mocheso o phahame, chlorine e kopantsoeng (chloramine) e tla susumelletseha ho kenya letsoho karabelong esale pele, e leng se hlahisang liphello tse phahameng tsa ClO2, haholo-holo chlorine ea mahala. Mokhoa oa pele oa ho laola ke ho laola mocheso. Hoo e ka bang 20°C, o ka boela oa eketsa DPD ho sampole ea metsi le ho e kopanya, ebe hang-hang u eketsa 0.5ml thioacetamide solution (4.7) ho emisa masala a kopantsoeng a chlorine (chloramine) ho tloha DPD. Boitšoaro.
Tšusumetso ea nako ea colorimetric: Ka lehlakoreng le leng, 'mala o mofubelu o hlahisoang ke ClO2 le DPD indicator ha o tsitsa. Ha 'mala o le lefifi, o fela ka potlako. Ka lehlakoreng le leng, ha tharollo ea phosphate buffer le letšoao la DPD li tsoakoa ha nako e ntse e ea, le tsona li tla fela. E hlahisa 'mala o mofubelu oa bohata,' me phihlelo e bontšitse hore ho se tsitse ha 'mala ho itšetlehile ka nako ke sesosa se ka sehloohong sa ho fokotsa ho nepahala ha data. Ka hona, ho potlakisa mohato o mong le o mong oa ts'ebetso ha ho ntse ho laola maemo a nako e sebelisoang mohatong o mong le o mong ho bohlokoa ho ntlafatsa ho nepahala. Ho ea ka phihlelo: nts'etsopele ea 'mala e ka tlaase ho 0.5 mg / L e ka tsitsa metsotso e ka bang 10 ho isa ho e 20, nts'etsopele ea mebala e ka bang 2.0 mg / L e ka ba e tsitsitseng metsotso e ka bang 3 ho isa ho e 5,' me nts'etsopele ea 'mala ka bongata bo kaholimo ho 5.0 mg/L e tla tsitsa ka nako e ka tlase ho motsotso o le mong.
TheLH-P3CLOhona joale e fanoeng ke Lianhua ke e nkehang habobebemetara e setseng ea chlorinee tsamaellanang le mokhoa oa photometric oa DPD.
Analyzer e se e behile wavelength le curve. U hloka feela ho eketsa li-reagents le ho etsa colorimetry ho fumana kapele liphetho tsa masala a chlorine, masala a chlorine le chlorine dioxide metsing. E boetse e ts'ehetsa phepelo ea matla a betri le phepelo ea motlakase ka tlung, e etsa hore ho be bonolo ho e sebelisa ebang ke kantle kapa ka laboratoring.
Nako ea poso: May-24-2024
