Description
Specifications Table
Product Name – Buffer solution, pH 4.00 (20 °C) / 7.00 (20 °C) / 9.00 AVS TITRINORM® buffers
Quantity/Pack Size – 30 × 30 ml sachets (pH 4.00) | 30 × 30 ml sachets (pH 7.00) | 30 × 30 ml sachets (pH 9.00)
Form – Liquid (ready-to-use solution)
Grade – Analytical Reagent (AR), NIST-traceable
Application – pH meter calibration, electrochemistry, titrations
Product Overview
AVS TITRINORM® pH buffer solutions are precision-formulated for reliable calibration of pH meters, electrodes, and analytical instruments across laboratory applications. Each buffer—pH 4.00, 7.00, and 9.00—is manufactured under stringent quality controls to meet NIST-traceable standards, ensuring consistency in measurements at 20 °C. The solutions are supplied in convenient 30 ml sachets, eliminating the need for manual dilution or contamination risks associated with bulk containers. The pH 4.00 buffer, derived from potassium hydrogen phthalate, provides a stable acidic reference, while the pH 7.00 neutral phosphate buffer serves as the primary calibration point for most laboratory workflows. The pH 9.00 buffer, based on borate or carbonate systems, covers alkaline range calibration with minimal temperature sensitivity. All variants are free from preservatives that could interfere with electrochemical readings, making them ideal for high-precision titrations, environmental monitoring, and quality control processes. The sachet packaging extends shelf life by reducing exposure to atmospheric CO₂, which can alter pH over time. Compatible with all major pH meter brands, these buffers adhere to ISO 17034 and DIN 19266 standards, guaranteeing accuracy within ±0.02 pH units. Their color-coded labels (red for pH 4.00, green for pH 7.00, blue for pH 9.00) streamline identification during routine lab operations.
FAQs
1. How do these buffers compare to powdered pH standards?
Ready-to-use liquid buffers eliminate weighing errors and dissolution steps associated with powdered standards. The sachet format ensures consistent concentration, whereas powders may absorb moisture, affecting accuracy.
2. Can these buffers be used for non-aqueous titrations?
AVS TITRINORM® buffers are optimized for aqueous systems. For non-aqueous titrations, specialized solvents or electrode-compatible buffers are recommended to avoid solvent interference with the glass membrane.
3. What is the typical shelf life after opening a sachet?
Once opened, the buffer remains stable for up to 3 months if stored in a tightly sealed container at 15–25 °C. Avoid prolonged exposure to air, as CO₂ absorption can shift the pH of alkaline buffers.
4. Are these buffers compatible with combination pH electrodes?
Yes, they are designed for use with all combination pH electrodes (glass/reference). The absence of silver ions or organic additives prevents reference junction clogging or membrane poisoning.
5. Why are the sachets preferred over larger bottles for calibration?
Sachets minimize contamination risks from repeated bottle openings and reduce oxidative degradation. The single-use format is cost-effective for labs with low sample throughput, as it eliminates waste from unused bulk solutions.
