mokhoa oa tlhahlobo bakeng sa dikahare tsa metsi a polymerized ferric sulfate

Mekhoa ea ho fumana metsi Polyferric sulfate likahare li akaretsoa, ​​​​tse arotsoeng ka mekhahlelo e meraro: ho lemoha index ea mantlha (tekanyo ea tšepe kaofela le tekanyo ea motheo ea letsoai) le mekhoa e thusang e thehiloeng ho litekanyetso tsa naha le theknoloji e sebelisoang hangata ea indasteri:

I. Kakaretso ea phumano ea tšepe (core index)

1.Potassium dichromate titration mokhoa (mokhoa oa naha o tloaelehileng oa arbitration)

1.Molao-motheo: Sebakeng se nang le asiti, tin chloride e sebelisoa ho fokotsa Fe³⁺ ho Fe²⁺, 'me tin chloride e feteletseng e ntšoa ka mercury chloride, ebe potassium dichromate e lebisoa pheletsong e pherese.

2. mohato :

3.① Nka sampole ea 1.5g + 20ml ea metsi + 20ml hydrochloric acid (1:1) → belisa motsotso o le mong;

4.② Eketsa tharollo ea stannous chloride ho 'mala o mosehla o nyamelang → phola kapele;

5.③ Eketsa 5ml saturated mercury chloride solution → ema motsotso o le mong;

6.④ Eketsa 50ml metsi + 10ml sebabole phosphorus e tsoakiloeng acid + 4 ~ 5 marotholi a sodium dianilatesulfonic acid → titrate ka potassium dichromate ho fihlela pherese (metsotsoana e 30 e sa nyamele).

7.Palo: kakaretso ea tšepe (%) = (V × C × 05585 × 100) / m

8.(V: bophahamo ba modumo, C: potassium dichromate concentration, m: sampole boima)

9.Tlhokomeliso: Mercury chloride e chefo 'me metsi a litšila a lokela ho lahloa ho latela melao.

2. Atomic absorption spectroscopy (AAS)

1.Molao-motheo: Ka mor'a hore sampuli e qhibilihe, liathomo tsa tšepe li monya leseli la maqhubu a tlhaho 'me li lekanyetsoa ka ho monya.

2. mohato :

3.① Mohlala o qhibilihisoa ka asiti e hlapollang (mohlala, hydrochloric acid) → sefa le ho hlapolla;

4.② Mokhoa o tloaelehileng oa curve bakeng sa qeto ea ho monya.

5.Melemo: ho nepahala ho phahameng (± 1%), ho ka lekanya mefuta e sa tšoaneng ea tšepe ka nako e le 'ngoe.

3. Potassium permanganate titration mokhoa (ho fokotsa ho lemoha lintho)

1.Kopo: Fe²⁺ phumano ea litaba (e ama ho nepahala ha tšepe kaofela).

2.Mohato: Mohlala + sulfuric acid / phosphoric acid → titrate e nang le 0.01mol / L potassium permanganate ho ea qetellong e khubelu.

Ⅱ. Ho lemoha motheo oa letsoai (matšoao a bohlokoa a thusang)

Molao-motheo: Hydrochloric acid e senya sampuli, potassium fluoride e pata ion ea tšepe, 'me sodium hydroxide e senya asiti ea mahala.

Mehato e tloaelehileng ea naha (GB/T14591-2016):

1.Nka 1.2 ~ 1.3g sampuli + 25ml hydrochloric acid e tloaelehileng tharollo → tlohela mocheso oa kamore bakeng sa metsotso ea 10;

2.Eketsa 10ml potassium fluoride solution (mask Fe³⁺) → Eketsa marotholi a 5 a phenolphthalein;

3.Titrate ka sodium hydroxide ho 'mala o mofubelu o mosehla (metsotsoana e 30 ntle le ho fela).

4.Palo: Tekanyo ea motheo (%) = [(V0-V) × C × 017 × 100] / (m × litaba tsa tšepe%)

5.(V0/V: molumo o se nang letho / mohlala oa titration, C: mahloriso a NaOH)

III. Mekhoa ea thuso ea kapele

1.Mokhoa oa ho kopana ha batho ba bangata

3.Scenario ea kopo: khakanyo e potlakileng sebakeng sa tlhahiso.

4. sebetsa:

5.① Mocheso o tsitsitseng (20±1℃) lekanya sampole ho densitometer;

6.② Ha boima bo boholo ho feta kapa bo lekana le 1.45g/cm³, kakaretso ea tšepe e ka bang 11.5%; haeba e ka tlase ho 1.3g/cm³, ha e tšoanelehe.

7.Meeli: E hloka ho lekanyetsoa ka titration.

2.pH ho lemoha

8.Standard: pH ea 1% ea tharollo ea metsi e lokela ho ba 2 ~ 3 (National standard GB / T14591-2016).

IV. Lintlha

1.Reagent calibration: Titrant (e kang potassium dichromate, sodium hydroxide) e lokela ho lekanyetsoa esale pele.

2. Pheliso ea litšitiso:

9.Ha tekanyo ea motheo e feta 16%, li-precipitates tsa tšepe tsa hydroxide li bonolo ho thehoa, kahoo ho laola acid e lokela ho ba thata;

10.Arsenic, lead le lisebelisoa tse ling tse boima li bonoa ke atomic absorption spectrometry.

3. Tshebetso e bolokehileng:

11.Mohato o belang oa hydrochloric acid o lokela ho etsoa ka mosi oa mosi;

12.Mercury chloride ke ntho e chefo e ngata, 'me ho khothalletsoa ho sebelisa mekhoa e se nang mercury (e kang mokhoa oa titanium trichloride).

sisinya

● Ho nepahala ho tlang pele: khetha mokhoa oa potassium dichromate (kakaretso ea tšepe) kapa mokhoa oa AAS (ho latela maemo a ISO);

● Ho hlahloba ka potlako: motsoako oa mokhoa oa ho teteana le mokhoa oa pH;

● Taolo ea boleng bo felletseng: ho lemoha ka nako e le 'ngoe letsoai (8% ~ 16% e nepahetse) le litšepe tse boima.