The HI 84432 is an easy to use microprocessor-based automatic minititrator and pH meter designed for the rapid and accurate analysis of Total Titratable Acidity in fruit juices. By eliminating subjective factors including color indicators, errors in mathematical calculations or erratic titrant additions from the measurement, the HI 84432 makes Total Titratable acidity analysis precisely. This will quickly become a valuable acidity analysis tool of fruit juices.
The instrument benefits from Hanna’s many years of experience as manufacturer of quality analytical instruments. A clear and well-designed user interface makes the instrument intuitive and simple to use. A dedicated HELP key aids in set-up, calibration, status and troubleshooting.
By simply pressing the START key, the HI 84432 automatically starts pump operation and titrates the sample to the end point. The HI 84432 has a simple and accurate peristaltic pump to ensure the best accuracy and repeatability. By performing pump calibration with the Hanna standard provided, the instrument accuracy is assured. The instrument employs a powerful and effective built-in algorithm to analyze the pH response to determine the exact pH endpoint, then uses this to make the necessary calculations.
The Titratable Acidity determination is instantaneously displayed in selected measurement units on the large dot matrix display. The instrument is ready for the next analysis immediately. Other features:
• Log on demand up to 100 samples (50 for pH measurement; 50 for titration results)
• GLP feature, to view last calibration data for pH electrode and pump
MEASUREMENT SIGNIFICANCE
Titratable acidity of fruit juices measures the concentration of titratable hydrogen ions contained in the fruit juices samples, by neutralization with strong base solution at fixed pH. This value includes all the substances of an acidic nature in the fruit juice: free hydrogen ions, organic acids, acid salts and cathions. Because the organic acid is the most acidic component of the fruit juices that react with strong bases solutions, the titratable acidity is usually expressed as g/L or g/100mL of the predominant acid contained:
• Citric acid is present in many fruits species.
• Tartaric acid is essentially found in grapes.
• Malic acid is present in many fruit species, sometimes together with citric acid or tartaric acid in unripe grapes.
| HI 84432 Advantages |
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- Methodology used is based on the AOAC International accepted method for acidity determination.
- Eliminates subjective factors
- Built in magnetic stirrer and electrode, titrant and beaker holders.
- Log on demand up to 100 samples (50) pH measurement; (50) titration.
- GLP feature to view last calibration data for pH electrode and pump.
- Can measure in % of Citric, Malic and Tartaric acid.
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- PC interface via USB connection
- Enhanced pH accuracy with 3 point calibration
- Automatic pH temperature compensation
- Automatic “anytime” help feature
- Dot matrix backlit LCD with an intuitive user interface
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Titratable acidity of fruit is an important parameter in determining fruit maturity.
| Fruits, juices |
Titratable acidity (g/100mL) |
Predominant acid |
| Apple, pear |
0.36-0.80 |
Malic acid |
| Cranberry |
1.6-3.6 |
Citric acid |
| Grapefruit |
1.2-2.0 |
Citric acid |
| Lemon |
4-6.2 |
Citric acid |
| Mango |
0.34-0.84 |
Citric acid |
| Orange |
0.8-1.4 |
Citric acid |
| Peach, nectarine, sweet cherry |
0.24-0.94 |
Citric acid |
| Pineapple |
0.7-1.6 |
Citric acid |
| Plum/Sour cherry |
0.94-1.64 |
Malic acid |
| Strawberry |
0.6-1.1 |
Citric acid |
| Table grape |
0.4-0.9 |
Tartaric acid |
| Tomato |
0.34-1.00 |
Citric acid |
The HI 84432 minititrator uses a method based on the Official Methods of Analysis of AOAC International. The fruit juice is titrated with a sodium hydroxide solution until the end point at 8.2 pH is reached (determined by potentiometric method). Additionaly the HI 84432 has a built-in pH meter for pH measurement (electrode and meter must be calibrated).
Order Information:
| HI 84432 minititrator is supplied complete with: |
• HI 1131B pH electrode
• HI 7662-M Temperature probe
• HI 84432-50 Titrant solution (100 mL)
• HI 84432-55 Pump calibration solution (100 mL)
• HI 7061M Cleaning solution (230 mL)
• HI 70300M Storage solution (230 mL)
• HI 7071 Filling solution (30 mL) |
• HI 7004M pH 4.01 buffer solution (230 mL)
• HI 7007M pH 7.01 buffer solution (230 mL)
• HI 70082M pH 8.20 buffer solution (230 mL)
• Two 100 mL beakers
• Tube set with dispensing tip
• Stir bars (medium 2 pcs.)
• 12 Vdc power adapter
• Instruction manual |
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