DPD spectrophotometry ndiyo yakajairwa nzira yekuona yemahara yakasara chlorine uye yakazara yasara chlorine muChina chiyero chenyika "Water Quality Vocabulary and Analytical Methods" GB11898-89, yakabatanidzwa neAmerican Public Health Association, iyo American Water Works Association uye iyo Water Pollution Control. Federation. Mu “Standard Test Methods for Water and Wastewater”, nzira yeDPD yakagadziridzwa kubva kuchinyorwa chechi15 uye inokurudzirwa senzira yakajairika yekuyedza chlorine dioxide.
Zvakanakira nzira yeDPD
Inogona kuparadzanisa chlorine dioxide kubva kune mamwe marudzi akasiyana eklorini (kusanganisira yemahara yakasara chlorine, yakazara yasara chlorine uye chlorite, nezvimwewo), zvichiita kuti zvive nyore kuita colorimetric bvunzo. Iyi nzira haina kurongeka seye amperometric titration, asi mhedzisiro yacho inokwana kune zvakawanda zvakajairika zvinangwa.
musimboti
Pasi pemamiriro epH 6.2 ~ 6.5, ClO2 inotanga kusangana neDPD kuti iite musanganiswa wakatsvuka, asi huwandu hunooneka hunosvika chikamu chimwe chete chezvishanu chehuwandu huripo hweklorini huripo (yakaenzana nekuderedza ClO2 kune chlorite ions). Kana sampuli yemvura yakagadziriswa muhupo hweiodide, chlorite uye chlorate inobatawo, uye kana yakasvibiswa nekuwedzera bicarbonate, ruvara runoguma rwunoenderana nehuwandu huripo hweklorini yeClO2. Kupindira kweklorini yakasununguka kunogona kudziviswa nekuwedzera glycine. Nheyo ndeyokuti glycine inogona kushandura pakarepo chlorine yemahara kuita chlorinated aminoacetic acid, asi haina mhedzisiro paClO2.
Potassium iodate standard stock solution, 1.006g/L: Wema 1.003g potassium iodate (KIO3, yakaomeswa pa120 ~ 140 ° C kwemaawa maviri), inonyunguduka mumvura-yakachena, uye kuendesa ku1000ml volume.
Dilute iyo yekuyeresa flask kune chiratidzo uye sanganisa.
Potassium iodate standard solution, 10.06mg/L: Tora 10.0ml yemushonga westock (4.1) mu1000ml volumetric flask, wedzera 1g ye potassium iodide (4.5), wedzera mvura kuti inyungurudze kune mucherechedzo, uye sanganisa. Gadzirira pazuva rekushandiswa mubhodhoro rebrown. 1.00ml yeiyi chiyero mhinduro ine 10.06μg KIO3, iyo yakaenzana ne1.00mg/L iripo chlorine.
Phosphate buffer: Dissolve 24g anhydrous disodium hydrogen phosphate uye 46g anhydrous potassium dihydrogen phosphate mumvura yakashambwa, wobva wasanganisa mu100ml yemvura yakashambwa ne800mg EDTA disodium munyu yakanyungudika. Dilute nemvura yakanyungudutswa kusvika ku1L, zvichida wedzera 20mg mercuric chloride kana 2 madonhwe e toluene kudzivirira kukura kwe mold. Kuwedzera 20 mg yemercuric chloride kunogona kubvisa kukanganiswa kwehuwandu hweiyo iodide inogona kuramba ichiyerwa yemahara chlorine. (Cherechedza: Mercury chloride ine chepfu, bata nekuchenjerera uye usapinda kunwa)
N, N-diethyl-p-phenylenediamine (DPD) Chiratidzo: Dissolve 1.5g DPD sulfate pentahydrate kana 1.1g anhydrous DPD sulfate mumvura isina chlorine isina chlorine ine 8ml1+3 sulfuric acid uye 200mg EDTA disodium munyu 1, dilute mubhodhoro regirazi revhu rakasvibira, uye chengeta munzvimbo ine rima. Kana iyo chiratidzo ichipera, inoda kuvandudzwa. Gara uchitarisa kukosha kwekunyura kwemasampuli asina chinhu,
Kana iyo yekunyudza kukosha kweiyo isina chinhu pa515nm ichipfuura 0.002 / cm, iyo gadziriso inoda kusiiwa.
Potassium iodide (KI crystal)
Sodium arsenite solution: Dissolve 5.0g NaAsO2 mumvura yakanyungudutswa uye shandura kusvika 1 litre. Ongorora: NaAsO2 ine muchetura, dzivisa kupinza!
Thioacetamide solution: Dissolve 125 mg ye thioacetamide mu 100 ml yemvura yakasvibiswa.
Glycine solution: Dissolve 20g glycine mumvura isina chlorine uye wedzera kusvika ku100ml. Chengetedza chando. Inoda kugadziriswa kana turbidity ichiitika.
Sulfuric acid solution (inenge 1mol/L): Dissolve 5.4ml concentrated H2SO4 in 100ml distilled water.
Sodium hydroxide solution (inenge 2mol/L): Weresa 8g NaOH woinyungudutsa mu100ml yakachena mvura.
Calibration (kushanda) curve
Kune dzakatevedzana makumi mashanu colorimetric machubhu, wedzera 0.0, 0.25, 0.50, 1.50, 2.50, 3.75, 5.00, 10.00ml ye potassium iodate yakajairwa mhinduro, zvichiteerana, wedzera nezve 1g ye potassium iodide uye 0.5mol sulfuri mira kwemaminetsi maviri, wobva wawedzera 0.5ml sodium hydroxide solution uye dilute kune mucherechedzo. Izvo zvakaiswa mubhodhoro rega rega zvakaenzana zvakaenzana ne0.00, 0.05, 0.10, 0.30, 0.50, 0.75, 1.00, uye 2.00 mg/L yeklorini iripo. Wedzera 2.5ml yephosphate buffer uye 2.5ml yeDPD chiratidzo chemhinduro, sanganisa zvakanaka, uye nekukasika (mukati memaminitsi maviri) pima kunyura pa515nm uchishandisa 1-inch cuvette. Dhirowa mwero wecurve wotsvaga regression equation.
Matanho ekutsunga
Chlorine dioxide: Wedzera 1ml yemushonga weglycine ku50ml yesampuli yemvura uye sanganisa, wobva wawedzera 2.5ml yephosphate buffer uye 2.5ml yeDPD indicator solution, sanganisa zvakanaka, woyera kunyura pakarepo (mukati memaminitsi maviri) (kuverenga ndiG).
Chlorine dioxide uye chlorine inowanikwa yemahara: Tora imwe 50ml yemvura sampu, wedzera 2.5ml phosphate buffer uye 2.5ml DPD chiratidzo chemhinduro, sanganisa zvakanaka, uye uyera kunyura nekukurumidza (mukati memaminitsi maviri) (kuverenga ndiA).
7.3 Chlorine dioxide, chlorine inowanikwa mahara uye chlorine iripo yakasanganiswa: Tora imwe 50ml yesampuli yemvura, wedzera 1g ye potassium iodide, wedzera 2.5ml yephosphate buffer uye 2.5ml yeDPD indicator solution, sanganisa zvakanaka, woyera kunyura nekukasika (mukati me Maminitsi maviri) (Kuverenga ndiC).
Khlorine iripo yese inosanganisira yemahara chlorine dioxide, chlorite, yemahara residual chlorine uye yakasanganiswa yasara chlorine: Mushure mekuwana kuverenga C, wedzera 0.5ml sulfuric acid solution pamushonga wemvura mubhodhoro reruvara rimwechete, uye sanganisa Mushure mekumira kwemaminetsi maviri, wedzera. 0.5 ml sodium hydroxide solution, sanganisa uye kuyera kunyura nekukurumidza (kuverenga ndiD).
ClO2=1.9G (yakaverengwa seClO2)
Klorine inowanika pachena=AG
Yakasanganiswa inowanikwa chlorine = CA
Zvose zviripo klorini=D
Chlorite=D-(C+4G)
Mhedzisiro yeManganese: Chinhu chinonyanya kukosha chinokanganisa chinowanikwa mumvura yekunwa manganese oxide. Mushure mekuwedzera phosphate buffer (4.3), wedzera 0.5 ~ 1.0ml sodium arsenite solution (4.6), uye wobva wawedzera DPD chiratidzo kuyera kunyura. Bvisa kuverenga uku kubva pakuverenga A kubvisa
Bvisa kukanganisa kubva kune manganese oxide.
Kufurira tembiricha: Pakati pese zvazvino nzira dzekuongorora dzinogona kusiyanisa ClO2, yemahara chlorine uye yakasanganiswa chlorine, kusanganisira amperometric titration, inoenderera iodometric nzira, nezvimwewo, tembiricha ichakanganisa kurongeka kwekusiyana. Kana tembiricha yakwira, chlorine yakasanganiswa (chloramine) inokurudzirwa kuti itore chikamu mune izvi pachine nguva, zvichikonzera mhedzisiro yepamusoro yeClO2, kunyanya yemahara chlorine. Nzira yekutanga yekudzora ndeyekudzora tembiricha. Panenge pa 20°C, unokwanisawo kuwedzera DPD kusampuli yemvura woisanganisa, wobva wawedzera pakarepo 0.5ml thioacetamide solution (4.7) kumisa yakasanganiswa yasara chlorine (chloramine) kubva kuDPD. Reaction.
Pesvedzero yenguva colorimetric: Kune rimwe divi, iyo tsvuku ruvara inogadzirwa neClO2 uye DPD chiratidzo haina kugadzikana. Iyo yakasviba ruvara, inokurumidza kupera. Kune rimwe divi, sezvo iyo phosphate buffer mhinduro uye DPD chiratidzo chakasanganiswa nekufamba kwenguva, ivo pachavo vanoperawo. Inogadzira ruvara rutsvuku rwenhema, uye ruzivo rwakaratidza kuti iyi nguva-inoenderana nekusagadzikana kwemavara ndicho chikonzero chikuru chekuderedzwa kwe data. Naizvozvo, kukurumidzira danho rega rega rekushanda uchidzora kumisikidzwa kwenguva inoshandiswa munhanho imwe neimwe kwakakosha pakuvandudza humbowo. Zvinoenderana neruzivo: kukura kweruvara pachikamu chiri pasi pe 0.5 mg/L kunogona kugadzikana kweanenge maminetsi gumi kusvika makumi maviri, kukura kweruvara pamwero we2.0 mg/L kunogona chete kugadzikana kwemaminetsi matatu kusvika mashanu, uye kuvandudzwa kwemavara pakusangana pamusoro pe5.0 mg/L kuchagadzikana kweisingasviki miniti imwe.
TheLH-P3CLOparizvino yakapihwa neLianhua inotakurikayasara chlorine mitaiyo inoenderana neDPD photometric nzira.
Iyo analyzer yakatoisa wavelength uye curve. Iwe unongoda kuwedzera reagents uye kuita colorimetry kuti nekukurumidza uwane mibairo yasara chlorine, yakazara yasara chlorine uye chlorine dioxide mumvura. Inotsigirawo magetsi ebhatiri uye magetsi emukati, zvichiita kuti zvive nyore kushandisa kunze kana murabhoritari.
Nguva yekutumira: May-24-2024
