Conductivity cell and its related technology in the conductance method of carbon and sulfur analysis - Database & Sql Blog Articles

Carbon sulfur rapid analyzer

The carbon-sulfur rapid analyzer is indispensable in steel production. The carbon and sulfur content in steel has a great influence on steel specifications, performance and quality. Therefore, the analysis of carbon and sulfur is extremely important. The following describes the conductivity cell and its related carbon and sulfur analysis. technology.

Power and electrode:

(

1

)power supply. In order to prevent and reduce the polarization phenomenon caused by the measurement conductance, the DC power source cannot be used as the power source for measuring the conductance. Because the direct current generates electrolysis, the electrolysis product appears at both poles, which not only affects the performance of the electrode, but also changes the composition and resistance of the solution. , causing serious errors in conductance measurements. Therefore, the power supply must use AC power. Generally, the frequency of AC power is commonly used.

1kHz

, it can change the direction of the conductivity of the cell every second

1000

Secondly, due to the alternating positive and negative, the oxidation or reduction reaction on the electrode alternates, and as a result, it can be considered that no oxidation or reduction reaction occurs, and the measurement result is accurate and reliable.

(

2

)electrode. Commonly used electrodes are platinum bright electrodes and platinum black electrodes, both of which are fixed to the electrodes in parallel with two platinum plates, and the distance between the electrodes is usually

1cm

about. In order to reduce the polarization, a platinum-like platinum black is usually plated on the platinum sheet, and as a result, the surface area is increased and the current density is reduced, which reduces the polarization and improves the sensitivity of the test. Compared with the bright platinum electrode, the surface of the platinum black electrode is adsorbed more seriously. In order to eliminate the adsorbed substances, hydrochloric acid is usually used for washing (not to be washed with "Wangshui"). Since the bright platinum electrode also has high sensitivity, in the case where the polarization phenomenon is not too serious, the bright platinum electrode is often used, which can reduce the contamination of the electrode by the adsorbed substance.

Requirements for conductivity absorbing liquid:

(

1

The purity of water is high. Constant carbon and sulfur determination. It can be distilled water; for the determination of low content of carbon and sulfur, deionized water should generally be used.

1M

Ω or more; for the determination of ultra-low carbon and sulfur, deionized water

8-10M

Ω or more.

(

2

Chemical reagents are required to be analytically pure, preferably in excellent grades. The conductivity liquid should be "dissolved" and the solution should be prepared according to the instructions.

(

3

Test to determine the amount of absorbent

30mL

It is more suitable. If the volume is too small, the absorption is unstable, the volume is too large, and the use is inconvenient.

(

4

) Absorbing liquid components, carbon absorption liquid

NaOH

Solution, in order to improve sensitivity, some use

Ba(OH)

2

Solution. The disadvantage is easy to generate

BaCO

3

Precipitate and stain the electrode. Adopted by this law

0.045mol/L

of

NaOH

Solution. Sulfur absorption liquid

H

2

O

2

Aqueous solution due to

H

2

O

2

in

Pt

Decomposition on the electrode, this method uses acidic

KIO

4

Solution, acidity is adjusted to

pH

value

3.3

.

Carbon-sulfur rapid analyzer Conductivity method Carbon-sulfur analysis is characterized by the ability to quickly and accurately determine low-level carbon and sulfur, and the use of single-chip, conductivity and arc furnace supporting analytical instruments to achieve the determination of carbon and sulfur in steel, Digital, automated.