Save up to 90% on your cost of ultrapure acids. The duoPUR, a quality sub-boiling distillation system, can produce up to 1 liter of high-purity acid from reagent grade stock in about six hours.

Click to view duoPUR video clip describing principle of operation (Requires QuickTime software.)

duoPUR Acid Purification System

Reagent contamination contributes to the concentration of the analytes present in a sample. The amount contributed is a function of the total quantity of reagent used. For example, 50 mL of a reagent that contains a contaminant at the 100 ppb level will contribute 5 μg of that species as contamination. Currently many laboratories purchase expensive high-purity acids for trace elemental analysis (five liters of high-purity HNO₃ costs about $1,500.00).

There is, however, an alternative. Milestone has developed the duoPUR, a sub-boiling distillation system which allows laboratories to make their own high-purity acids. The duoPUR can produce 1 liter (500 mL per quartz unit) of high-purity acid from reagent grade acid in about six hours.

The duoPUR consists of two high-purity quartz distillation units. Each unit contains two infrared heating elements which supply a maximum power of 1,250 W, a water-cooled condenser, and a reagent collection bottle. The distillation process is microprocessor-controlled, allowing the user to set the distillation time and power level.

Milestone offers this acid purification system in two models: the duoPUR (with two stills that run in parallel, purifying the same or different acids), and the single-still subPUR, for labs whose needs are more modest

Cost Savings

Producing high-purity acid on demand reduces the cost of 5 liters of high-purity acid to about $90. The savings on reagents alone dramatically reduces the total cost per sample. The duoPUR also gives you the ability to re-purify acids that have become contaminated, further adding to your cost savings.

To determine your potential return on investment, use our quick and easy duoPUR Cost Savings Calculator.

To add to your savings even further, we are currently making this special limited-time offer: 0% Financing for 12 months on the purchase of a duoPUR or subPUR system.

More Information on duoPUR

For detailed technical information (including a brief video clip) about the instrument and its operation, continue to the duoPUR technical details page.

You can also read the article On-Demand Production of High-Purity Acids in the Analytical Laboratory, by Dr. Robert Richter, Dr. Dirk Link, and Dr. H.M. "Skip" Kingston of Duquesne University, from the January 2000 issue of Spectroscopy. To request a free copy of this article, click here.

Clean Chemistry: Continue to trace cleaning, closed-vessel digestion, sample evaporation, or vessel inserts.
General: Go to the Milestone front page, or send us an inquiry.