Milestone has developed the duoPUR and subPUR, sub-boiling distillation systems which allow laboratories to make their own high purity acids at dramatically reduced costs.

The chemical reagents used during the analysis are an important source of the analytical blank. Sub-boiling distillation has been demonstrated to be the best method of acid purification. Offering an optimal purification method for preparation of high purity reagents, this type of acid distillation uses contactless infrared lamps to vaporize the surface liquid at a temperature typically 20°C below the boiling point.
In contrast to conventional distillation systems, where strong boiling action generating aerosolized particles results in contamination of the original liquid with the distillate, the duoPUR acid purification system using sub-boiling technology provides gentle surface evaporation preventing the formation of spray or droplets and yields to ultrapure acids.
The duoPUR offers an alternative to the purchase of expensive high purity acids for trace elemental analyses.

"Our expert in Digestion, Extraction, Syntesis and Evaporation with more than 20 years experience in the field of sales and service. Contact me for if you have questions or need a quotation"

Why sub-boiling technology?

duoPUR Quartz sub-boiling system

Read our book! It explains how a laboratory can reach full control of analytical blanks and sample preparation for obtaining accurate results. The application of instruments and strategies to control sample prep blank is often called a “Clean Chemistry” technique. This book discusses the factors impacting blank quality, in particular when microwave digestion is used, and reviews some Clean Chemistry products and technologies designed to help the analyst generate superior analytical data on their ICP-OES or ICP-MS instrumentation.

The Milestone subCLEAN is a compact and easy-to-use sub-boiling system suitable for the purification of HF, as well as for HNO3 and HCl.

The chemical reagents used during the analysis are an important source of the analytical blank. Sub-boiling distillation systems has been demonstrated to be the the leading method of acid purification.
In contrast to acid purification through conventional distillation, where strong boiling action generating aerosolized particles results in contamination of the original liquid with the distillate, acid distillation system using sub-boiling technology prevents the formation of spray or droplets and yields to a very high pure acid.
The Milestone subCLEAN is a compact and easy-to-use sub-boiling system, where all parts in contact with acids are made of high-purity fluoropolymers. Offering an optimal purification method for preparation of high purity reagents, our subCLEAN system is therefore suitable for HF, as well as for HNO3 and hydrochloric acid purification.

"Our expert in Digestion, Extraction, Syntesis and Evaporation with more than 20 years experience in the field of sales and service. Contact me for if you have questions or need a quotation"

Why sub-boiling technology?

The container to be cleaned is placed over a PTFE coated glass rod. Acid in the lower reservoir is heated, and purified acid vapor travels up through the glass rod and condenses on the container, removing surface contamination. This method of cleaning is a preferred alternative to the soaking preconditioning methods for the following reasons:

1, The trace metal contamination found in the reagent grade acid remains in the lower reservoir and does not come in contact with the component to be cleaned.
2. The clean component does not remain in contact with the cleaning acid after the surface contamination is removed.
3. The critical surfaces of the clean component are dry when the cleaning process is complete. This eliminates the need for rinsing and air drying.
4. The cleaning process takes place in a sealed container which minimizes airborne contamination and provides a clean environment for the components to be stored until they are needed.

Read our book! It explains how a laboratory can reach full control of analytical blanks and sample preparation for obtaining accurate results. The application of instruments and strategies to control sample prep blank is often called a “Clean Chemistry” technique. This book discusses the factors impacting blank quality, in particular when microwave digestion is used, and reviews some Clean Chemistry products and technologies designed to help the analyst generate superior analytical data on their ICP-OES or ICP-MS instrumentation.

traceCLEAN assures best cleaning quality of your TFM, glass and quartz parts for ICP/ICP-MS accessories. Any trace metal contaminants that are present in the cleaning acid stay within the reservoir and do not come in contact with the cleaned trace accessories.

Cleaning various items used in ultra-trace analysis work is a critically important laboratory routine. To minimize contamination, traditional cleaning methods require soaking items in hot acids, often for several hours. To be effective large volumes of acid are consumed and need to be changes regularly. There is also a substantial risk of exposure to hot acids and acid vapors using traditional soaking techniques. To address these issues, Milestone has developed the traceCLEAN, a fully automated, self-contained, acid steam cleaning system for trace metal analysis accessories.

"Our expert in Digestion, Extraction, Syntesis and Evaporation with more than 20 years experience in the field of sales and service. Contact me for if you have questions or need a quotation"

How it works

The container to be cleaned is placed over a PTFE coated glass rod. Acid in the lower reservoir is heated, and purified acid vapor travels up through the glass rod and condenses on the container, removing surface contamination. This method of cleaning is a preferred alternative to the soaking preconditioning methods for the following reasons:

1, The trace metal contamination found in the reagent grade acid remains in the lower reservoir and does not come in contact with the component to be cleaned.
2. The clean component does not remain in contact with the cleaning acid after the surface contamination is removed.
3. The critical surfaces of the clean component are dry when the cleaning process is complete. This eliminates the need for rinsing and air drying.
4. The cleaning process takes place in a sealed container which minimizes airborne contamination and provides a clean environment for the components to be stored until they are needed.

Read our book! It explains how a laboratory can reach full control of analytical blanks and sample preparation for obtaining accurate results. The application of instruments and strategies to control sample prep blank is often called a “Clean Chemistry” technique. This book discusses the factors impacting blank quality, in particular when microwave digestion is used, and reviews some Clean Chemistry products and technologies designed to help the analyst generate superior analytical data on their ICP-OES or ICP-MS instrumentation.

Setting new standards in vessel inside vessel technology  
We introduce the best of vessel-inside-vessel solutions to ensure lower analytical blank during microwave digestion in modern laboratory. This configuration reduces the amount of acid required for digestion to near stoichiometric quantities which provides lower dilution factor to increase detection limit

Microwave digestion techniques typically require a minimum volume of reagents of about 5 mL to achieve accurate temperature monitoring of the reaction conditions and for low blank levels. However sometimes it is important to maintain an even lower dilution factor when working at concentrations near the method detection limit. These factors inspired us to use vessel-inside-vessel technology. It uses smaller secondary vessel (2) inside the primary microwave vessel (1). The secondary vessel contains sample and digestion reagents (3), while the primary vessel contains the solution in which temperature control takes place.
This setup reduces the amount of acid required for digestion, lowering dilution factor and increasing detection limit.
A variety of vessel inserts is available from Milestone in different materials (Quartz or TFM) provided in different sizes and shapes, to satisfy all application requirements.

"Our expert in Digestion, Extraction, Syntesis and Evaporation with more than 20 years experience in the field of sales and service. Contact me for if you have questions or need a quotation"

Why maintaining a very low dilution factor

Three blanks were analyzed in run #1. The same blank was prepared along with two Animal Tissue samples, showing no cross contamination.

Blank 2 mL HNO3. Analysis by ICP-AES

Sample weight 100 mg. Blank 2 mL HNO3. Analysis by ICP-AES

Polyethylene EC680K Sample weight 200 mg. Blank 2 mL HNO3. Analysis by ICP-AES

Human Hair IAEA 085 Sample weight 100 mg. Blank 2 mL HNO3. Analysis by ICP-AES

Read our book! It explains how a laboratory can reach full control of analytical blanks and sample preparation for obtaining accurate results. The application of instruments and strategies to control sample prep blank is often called a “Clean Chemistry” technique. This book discusses the factors impacting blank quality, in particular when microwave digestion is used, and reviews some Clean Chemistry products and technologies designed to help the analyst generate superior analytical data on their ICP-OES or ICP-MS instrumentation.