GB5009.227 Automatic Potential Drop Point Meter Range ≥ 0.001 MgKOH/G Accuracy ±0.2% F·S

ST-13A Automatic potential drop point meter

The ST-13A automatic potentiometric titrator is designed according to the second method of GB5009.229-2016 "Determination of Acid Value in Foods", the cold solvent automatic potentiometric titration method, and GB5009.227-2023 "Determination of Peroxide Value in Foods" and other standards.

The instrument uses potentiometric titration to automatically distinguish the endpoint of titration and calculate the result automatically. This instrument is suitable for the determination of acid value in various samples such as food acid value. The determination of acid value is one of the important indicators for judging the quality of edible oil. The titration system adopts imported components, which are processed from corrosion-resistant materials, with accurate instrument measurement results and long service life.

Instrument features:

●Universal microcomputer operating system, The Windows 10 operating system adopts a human-machine dialogue mode for operation, with clear steps, simple and easy operation; Special software with a Chinese window interface, operated by mouse and keyboard, and easy to understand human-machine dialogue.

●Real time display of potential curve (E-V), first derivative curve (dE/dV), electrode potential (E), titration volume (V), and titration result

●Full process titration data browsing, powerful data processing function, easy to reprocess results; The titration results, data, and curves are stored in large quantities, and the titration process data can be saved as an Excel document for future reference

●Automatically print curves, results, and titration data

●Dynamic equivalent point titration (DET), equivalent equivalent equivalent point titration (MET), pre-set endpoint potential titration (SET)

●Fully automatic "endpoint" discrimination, effectively filtering out false "endpoints"

●Automatic cleaning, automatic fluid replenishment, and automatic constant liquid addition

Technical Parameter:

Measurement range : ≥ 0.001 mgKOH/g

Potential measurement range : -2000.0 ~ +2000.0 mV

Basic error of electronic unit : 0.1% F · S ± 0.1 mV

Input impedance : ≥ 1×1012 Ω

Volume of burette : 10mL

Minimum titration volume : 0.001mL

Accuracy of burette : ± 0.2% F·S

Precision : meets or exceeds relevant standards

Size : 350 * 280 * 380mm

Weight : 18kg

Note : The appearance pictures, dimensions, volume, and weight of the instrument are for reference only. If there are any updates to the instrument, there may be slight changes without prior notice.

Instrument Quality Assurance Certificate

Shandong Shengtai Instrument Co., Ltd. provides the following quality assurance for the instruments sold to you:

----The provided instrument materials are brand new, meet quality standards, and have a manufacturer's certificate of conformity;

----The materials and main components provided meet the technical requirements specified in the technical documentation;

----The overall quality assurance period of the equipment is one year (excluding normal wear and tear of vulnerable parts).

----We are responsible for free maintenance of any instrument quality issues that occur during the warranty period. Due to equipment malfunction caused by the user's responsibility, we are responsible for repairing and charging reasonable fees.

----Lifetime discounted supply of parts for equipment, and lifetime maintenance and repair of the entire machine.

----After the expiration of the warranty period, if the user needs maintenance and technical services, we will only charge a cost fee.

Packing list

Potentiometric titration method for determining acid value reagents(Self provided reagents):

Reagent:

Isopropanol (C₃H₈O)

C₄H₁₀O

Anhydrous C₄H₁₀O

Light petroleum, boiling range of 30 ℃ -60 ℃

Reagent preparation:

●Potassium hydroxide standard titration aqueous solution with a concentration of 0.1mol/L, prepared and calibrated according to the requirements of GB/T601 standard, or commercially available reagents can be purchased.

●C4H10O isopropanol mixture: C4H10O+isopropanol=1+1500ml of C4H10O and 500ml of isopropanol are thoroughly miscible and mixed, and prepared on site when needed.

Potentiometric titration method peroxide value reagent (prepared by oneself) (excerpted from national standards):

Reagent:

●Ice acetic acid( CH₃COOH )

●Isooctane( C₈H₁₈ )

●Potassium iodide( KI )

●Sodium thiosulfate.( Na₂S₂O₃• 5H₂O)

●Potassium dichromate: working standard reagent.( K₂Cr₂O₇ )

Reagent preparation:

9.2.1 Isooctane glacial acetic acid mixture (40+60): Measure 40 mL of isooctane, add 60 mL, and mix with glacial acetic acid.

9.2.2 Potassium iodide saturated solution: Weigh 20g of potassium iodide, add 10mL of freshly boiled and cooled water, mix well, and store in a brown bottle in a dark place for later use. Ensure the presence of saturated potassium iodide crystals in the solution. Pre use inspection: in 30 mL of isooctane acetic acid mixture.

Add 0.5mL of potassium iodide saturated solution and 2 drops of 1% starch indicator to (9.2.1). If a blue color appears, it needs to be eliminated with at least 1 drop of 0.01mol/1 sodium thiosulfate solution This solution should be reconfigured.

9.3 Standard solution preparation

9.3.1 0.1 mol/L Sodium Thiosulfate Standard Solution: Weigh 26 g of sodium thiosulfate and add 0.2 g of anhydrous sodium carbonate, dissolve in 100 ml of water and slowly boil for 10 minutes to cool. Filter and calibrate after two weeks of storage.

9.3.2 0.01 mol/L sodium thiosulfate standard solution: made by diluting 9.3.1 with newly boiled and cooled water. Prepare before use.