JQ-100 standard COD digester (8 tubes)

Product Overview: JQ-100 type standard COD digester (8 tubes)Following the new national standard HJ 828-2017Replace（GB 11914-89）The standard analytical method has standardized the development of chemical oxygen demand for water qualityCOD（Cr）The measurement steps strictly specify the heating and digestion time of the method, ensuring reflux heating and slight boiling2The digestion operation for hours, the preparation and addition of reagent solution are all in accordance with the national standardLaw consistency ensures reliabilitycorrectThe analysis results. JQ-The 100 type standard COD digester can achieve the goal of saving water, reducing power load, and improving efficiency for enterprise users.

Product features: JQ-100 standard COD digester, using microcomputer technology and reasonable design, can simultaneously perform heating reflux digestion on 8 250ML cylindrical digestion bottles* According to the HJ 828-2017 national standard method, high-quality electric furnace wire is selected, with the correct heating power and a slight boiling time of 2 hours.

The JQ-100 standard COD digester uses a specially designed silicon carbide heating plate for heating, with uniform surface heating and fast heating and cooling rates.

The JQ-100 standard COD digester can set the digestion time and display a countdown to the digestion time. After digestion is complete, the instrument automatically stops heating and the fan continues to work to assist in sample cooling. It can be left unattended. The entire mechanical structure design of the digester is reasonable, and the shell design is fashionable and novel, which adoptsPhosphating treatment and spray coating machine casingMade, easy to clean, and increases service life (users can also choose to configure with a 304 stainless steel casing).

JQ-100 typeStandard COD digesterUsing glass burr reflux pipes instead of spherical reflux pipes, and replacing tap water cooling with air cooling technology. The cooling part is mainly completed by burr condensation tubes and fans. The upper part of the condensation tube is spherical, and the catalyst is added from here to prevent the instantaneous volatilization of light components in the sample. The lower part is“burr”Shape, protruding from the wall of a condenser tube on a planeThree opposing sides“Cold Bubble”Larger cooling area than a simple spherical condenser tubeAnd it can block the passage of volatile substances and vapors, coupled with the dual effect of cooling water in the upper spherical reflux tube and the fan inside the machine, ensuring the reflux cooling of the sample.

Technical specifications:

Measurement range:10-700mg/L (measured after dilution of water samples greater than 700mg/L)

Measurement time: no more than 2 hours

Measurement error: Potassium hydrogen phthalate standard solution (500mg/L), relative standard deviation not greater than 5.0%, industrial organic wastewater (500mg/L), relative standard deviation not greater than 8.0%

Environmental temperature: 5-40 ℃

Heating power: 1200W (AC 220V ± 22V, 50HZ)

Specific operating steps:Add 10ml of sample to a 250mL cylindrical digestion bottle with a standard grinding mouth of No. 24, then add 2mL of mercury sulfate solution, followed by 5.0mL of 0.250mol/L potassium dichromate standard solution and several explosion-proof boiling glass beads. Shake well. Connect the conical bottle to the lower end of the burr condenser tube. Slowly add 15mL of silver sulfate sulfuric acid reagent from the top of the condenser tube to prevent the escape of low boiling point organic matter, and continuously rotate the conical flask to mix it evenly. Reflux the solution for two hours from the beginning of boiling. After cooling, rinse the condenser tube with 45mL of distilled water from the upper end, and then remove the conical flask. After cooling the solution to room temperature, add 3 drops of 1,10-phenanthroline indicator solution and mix evenly. Titrate with ammonium ferrous sulfate standard titration solution, and the endpoint is when the color of the solution changes from yellow to reddish brown after blue-green. Record the consumption volume of ammonium ferrous sulfate standard solution and calculate the result according to the method standard.