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will be measured by The samples of each accession 10.00ml0.01mol / L standard solution of iodine,[link widoczny dla zalogowanych], together with 5ml hydrochloric acid, Mesa mix. Placed in the dark 10min,[link widoczny dla zalogowanych], with 0.01mol / L sodium thiosulfate standard solution titration until the solution is light yellow, add 1ml of starch indicator solution and continue titration until the blue just disappeared.

Vi - titration of sulfide content, the amount of sodium thiosulfate standard solution, ml ;




15) Iron

c - the concentration of sodium thiosulfate standard solution (mol / L).




(5) filter paper: acid and after hardening, to fine sediment retention of dense ash-free filter paper (quantitative filter paper that is slow)

iodine standard solution C (1/2I2) = 0.01 mol / L: Pipette 10.00 ml of standard solution of iodine in 100ml brown volumetric flask. Dilute with water to marking, Shake, preparation before use.
potassium dichromate standard solution: C (1/6K2Cr2O7) = 0.2500mol / L 2h weighed 105 ℃ drying base or excellent grade potassium dichromate 12.258g soluble in water, diluted to 1000ml .







calibration: iodine in 250ml bottle, add 1g of potassium iodide and 50ml water, add 15.00ml; plus potassium dichromate standard solution into the hydrochloric acid solution 5ml, Mesa shake. The dark standing 5min. Calibrated using sodium thiosulfate solution to be titrated to the pale yellow solution, add 1ml powder indicator set to continue titration to the disappearance of the blue just to record the amount of standard solution, while for the blank titration.


in the industrial production process can not, under any circumstances to the air emissions of hydrogen sulfide. Use of gas must be in a sealed exhaust system or high efficiency in the kitchen. If the air contains 0.1% of the H2S will quickly lead to headaches, dizziness and so on. Absorbing large quantities of H2S can cause coma or death. Regular contact will cause chronic poisoning, caused by feeling bad,[link widoczny dla zalogowanych], weight loss, headache and so on. Industry, the H2S content of the air shall not exceed 0.01mg / L.
thiosulfate C (Na2S2O3) = 0.1mol / L.

phosphate (pPO4): ρ = 1.69 g / ml


1.1 Apparatus
= 3.8468
1.3.3 emission standards



(4) 25ml or 50ml acid burette, conical flask, pipette,[link widoczny dla zalogowanych], volumetric flask.

Introduction

ash to be treated with a solution of pre-soaking 24h.
order: k = C × 16.03 × 1000 ÷ V
C = 0.1000 × 15.00 ÷ (V1-V2)

iodine standard solution C (1/2I2) = 0.1mol / L: Weigh 12.70g of iodine in 500ml beaker, add 40g potassium iodide, increases the amount of water dissolved, transfer to a brown solution 1000ml bottle dilute to mark lines, Shake, Move to save the stand-brown bottle.
(9) PHS-3C precision pH meter.
V2 - titration blank solution is the amount of sodium thiosulfate standard solution (ml); 0.1000 - the concentration of potassium dichromate standard solution (mol / L).


( 25ml or 50 ml brown burette.
1.4 blank test

1.3.1 sulfide measurement
k is calculated at this time, the general value of 3.8468
is: C Na2S2O3 = 0.1 × 15 ÷ (15.7-3)

(1) PVC ion-exchange column.

1.3.2 The results indicated that

to double distilled water instead of sample, add 50ml and determination of when to take the same volume of reagents, by (1.3) as described in steps blank test.
(3) filter paper: acid and after hardening,





where: V0 - the blank test, the amount of sodium thiosulfate standard solution, ml;
thiosulfate concentration C (mol / L) is calculated as follows:
16.03 - sulfur ions (1/2S2-) molar mass (g / mol)
Keywords: fly ash sulfur water electrolysis
1g can be capacitive starch, dissolved in boiling water, in a constant volume to 100ml, cooling backup.



preconditioning: time to take the right amount of dried before use by adding an appropriate amount of iron powder detergent washing twice and each time cleaning to stir until the liquid is not black. Hydrochloric acid and then use the 1 +3 (1 volume of hydrochloric acid by adding 3 volumes of water) is not turbid liquid washing to date,[link widoczny dla zalogowanych], and rinse with distilled water three times to ensure that no hydrochloric acid to the surface of residual iron rust.
ash



1.3 experimental content

Source: Tong iron factory in Wuhu city flower.




phosphoric acid solution: (1 +1).


potassium iodide.

including the solubility of sulfide in water H2S, HS-, S2-, and the presence of suspended solids in the <LABEL class=lb onclick=and the electrolysis is not organic, inorganic sulfides. Dissipation of hydrogen sulfide from the water easily in the air, odor, and toxic. It works with the body of cytochrome, enzymes such substances in the oxidation of disulfide bonds (-S-S-) effects of cell oxidation process, resulting in tissue hypoxia, endangering human life. In addition to hydrogen sulfide corrosion of the metal itself, but also can be <LABEL class=lb onclick=Therefore, the sulfide is an important water pollution indicator (clean water, hydrogen sulfide in the olfactory domain is 0.035μg / L).

calibration is the consumption volume of Na2S2O3 15.7ml
with this concentration of

(6) Burette stand, 4 sets.
V - sample volume, 50ml;



titration of sodium thiosulfate standard solution C (Na2S2O3) = 0.1mol / L: Pipette 10.00ml just above the iodine standard calibrated standard solution of sodium thiosulfate dissolved in 100ml brown volumetric flask, diluted with water to the scale, shake, use preparation.
preparation: Weigh 24.4682g five hydrated sodium thiosulfate C (Na2S2O3 · 5pO) and 0.2003g of anhydrous sodium carbonate (Na2CO3) soluble in water, transferred to the 1000ml flask, diluted to a standard scale Mix and stored in brown bottle.

1. reagents and equipment

hydrochloric acid solution: (1 +1), prepared with hydrochloric acid.
Chapter 1 Experimental
potassium dichromate standard solution: C (1/6K2Cr2O7) = 0.1000mol / L. Drying weighed 105 ℃ 2h baseline or excellent grade potassium dichromate 4.9030g soluble in water, diluted to 1000ml.
sodium hydroxide solution: C (NaOH) = 1mol / L. The capacity of 20g sodium hydroxide in 250ml water, cooled to room temperature, diluted to 500ml.
AS number SiO2Fe2O3Al2O3CaOMgOTiO2SO3K2ONa2OP2O5 Jiexiu LOI total sample 52.9410.4032.261.290.171.040.550.960.140.149.02
Electrolysis ash sulfur Wastewater Pretreatment


Abstract: Fly ash is a certain activity with 6% of the spherical fine particles of carbon impurities in the water with electrolysis and adsorption capabilities, the use of fly ash treatment of industrial wastewater can be described by Waste and wastewater treatment costs Low effective. This has been extensively about technology's importance in the use of fly ash in wastewater treatment research has been done and achieved gratifying results [2]. Composition of the fly ash and iron sulfur wastewater micro-cell treatment methods and to explore its mechanism. Orthogonal experimental test of zero return in the small scale of the dynamic pH, iron and coal, and hydraulic retention time than the three factors, but also coal and iron than the reaction time and made a single factor of experiment. Influent wastewater concentration and reflux ratio were experimental study. Experimental results show that the pH value of 8.00 again, coal and iron ratio of 1:2, the hydraulic retention time of 30min, the influent concentration of 14.5mg / l and when the reflux ratio of 5:1 treatment was the best, up 86.07%, the concentration of emissions can be controlled at 2mg / l or less, up to the national emission standards for three. Chinese papers League finishing.
processing sulfide content ci (mg / L) is calculated as follows:
(7) 150ml or 250ml bottle of iodine.
object of this experiment is to measure the S2-, the initial concentration of about 10mg / L, the emission concentration (?????) three national emission standards: 2mg / L.


type in: V1 - when the titration of sodium thiosulfate standard solution of potassium dichromate standard solution amount (ml);
hydrochloric acid: ρ = 1.19g/ml


Table 1-1 Composition of fly ash /%
= 0.118mol / L the reagent is dispensed Na2S2O3 concentration of standard solution is 0.00118 mol / L


(2) ion exchange column of the pump 2 sets.

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