ọna idanwo fun akoonu ti omi polymerized ferric sulfate

Awọn ọna wiwa ti omi Polyferric imi-ọjọ A ṣe akopọ akoonu, eyiti o pin si awọn ẹka mẹta: wiwa atọka akọkọ (apapọ akoonu irin ati alefa ipilẹ iyọ) ati awọn ọna iranlọwọ ti o da lori awọn iṣedede orilẹ-ede ati awọn imọ-ẹrọ ile-iṣẹ ti a lo nigbagbogbo:

I. Lapapọ wiwa akoonu irin (itọka mojuto)

1.Potassium dichromate ọna titration (ọna orilẹ-ede adajọ idajọ)

1.Principle: Ni agbegbe ekikan kan, kiloraidi tin ni a lo lati dinku Fe³⁺ si Fe²⁺, ati pe o pọju tin kiloraidi jẹ imukuro nipasẹ chloride mercury, lẹhinna potasiomu dichromate ti wa ni titrated si aaye ipari eleyi ti.

2.igbese:

3.① Mu ayẹwo 1.5g + 20ml omi + 20ml hydrochloric acid (1: 1) → sise fun iṣẹju 1;

4.② Ṣafikun ojutu kan ti kiloraidi stannous si awọ ofeefee parẹ → dara ni iyara;

5.③ Ṣafikun 5ml ti o kun mercury kiloraidi ojutu → duro fun iṣẹju 1;

6.④ Fi omi 50ml kun + 10ml sulfur irawọ owurọ adalu acid + 4 ~ 5 silė ti sodium dianilatesulfonic acid → titrate pẹlu potasiomu dichromate titi eleyi ti (30 aaya ko ni ipare).

7.Iṣiro: apapọ akoonu irin (%) = (V × C × 05585 × 100) / m

8. (V: iwọn didun titration, C: ifọkansi dichromate potasiomu, m: ibi-apẹẹrẹ)

9.Note: Mercury kiloraidi jẹ majele ati omi egbin yẹ ki o sọnu ni ibamu pẹlu awọn ilana.

2.Atomic absorption spectroscopy (AAS)

1.Principle: Lẹhin ti awọn ayẹwo ti wa ni tituka, irin awọn ọta fa ti iwa wefulenti ina ati ti wa ni iwon nipa absorbance.

2.igbese:

3.① Ayẹwo ti wa ni tituka ni dilute acid (fun apẹẹrẹ, hydrochloric acid) → àlẹmọ ati dilute;

4.② Ilana ọna kika fun ipinnu gbigba.

5.Advantages: iṣedede giga (± 1%), le ṣe iwọn awọn orisirisi awọn irin ni akoko kanna.

3.Potassium permanganate ọna titration (idinku wiwa nkan)

1.Application: Fe²⁺ wiwa akoonu (ni ipa lori deede ti irin lapapọ).

2.Igbese: Ayẹwo + sulfuric acid / phosphoric acid → titrate pẹlu 0.01mol / L potasiomu permanganate si aaye ipari pupa.

Ⅱ. Ṣiṣawari ipilẹ iyọ (awọn afihan oluranlọwọ bọtini)

Ilana: Hydrochloric acid depolymerizes ayẹwo, potasiomu fluoride boju ion irin, ati sodium hydroxide titrate acid ọfẹ.

Awọn igbesẹ boṣewa orilẹ-ede (GB/T14591-2016):

1.Take 1.2 ~ 1.3g sample + 25ml hydrochloric acid standard solution → lọ kuro ni iwọn otutu yara fun awọn iṣẹju 10;

2.Fi 10ml potasiomu fluoride ojutu (boju Fe³⁺) → Fi 5 silė phenolphthalein;

3.Titrate pẹlu iṣuu soda hydroxide si awọ pupa ti o ni awọ (30 awọn aaya laisi idinku).

4.Iṣiro: Iwọn ipilẹ (%) = [(V0-V) × C × 017 × 100] / (m × akoonu irin%)

5.(V0/V: òfo/apẹẹrẹ iwọn didun titration, C: NaOH fojusi)

III. Awọn ọna iranlọwọ-kiakia

1.Density sepo ọna

3.Application ohn: dekun ifoju lori isejade ojula.

4.ṣiṣẹ:

5.① otutu otutu (20 ± 1 ℃) wiwọn ayẹwo sinu densitometer;

6.② Nigbati iwuwo ba tobi ju tabi dogba si 1.45g/cm³, apapọ akoonu irin jẹ nipa 11.5%; ti o ba jẹ kere ju 1.3g/cm³, ko ṣe deede.

7.Limitations: O nilo lati wa ni calibrated pẹlu titration.

2.pH erin

8.Standard: Awọn pH ti 1% olomi ojutu yẹ ki o wa 2 ~ 3 ( National Standard GB / T14591-2016).

IV. Awọn akọsilẹ

1.Reagent calibration: Titrant (gẹgẹbi potasiomu dichromate, sodium hydroxide) yẹ ki o wa ni iṣaju ni ilosiwaju.

2.Imukuro kikọlu:

9.Nigbati ipele ipilẹ jẹ diẹ sii ju 16%, iron hydroxide precipitates jẹ rọrun lati ṣẹda, nitorina iṣakoso acid yẹ ki o jẹ muna;

10.Arsenic, asiwaju ati awọn irin miiran ti o wuwo ni a rii nipasẹ spectrometry gbigba atomiki.

3.ailewu isẹ:

11.The farabale igbese ti hydrochloric acid yẹ ki o ṣee ṣe ni a fume Hood;

12.Mercury kiloraidi jẹ nkan ti o majele ti o ga julọ, ati pe o niyanju lati lo awọn ọna ti ko ni mercury (gẹgẹbi ọna titanium trichloride).

daba

● Ipese pataki: yan ọna dichromate potasiomu (irin lapapọ) tabi ọna AAS (ni ila pẹlu boṣewa ISO);

● Ṣiṣayẹwo iyara: apapo ọna iwuwo ati ọna pH;

● Iṣakoso didara okeerẹ: wiwa nigbakanna ti salinity (8% ~ 16% jẹ aipe) ati awọn irin eru.