MicroChemLab Will Give Us Cool, Clear Water

A couple of months ago, the water supply for the Town of Peterborough, NH, was found to contain unacceptable levels of E. coli bacteria. This unhappy discovery was made during a routine test; the word went out to boil all drinking and cooking water, and no one got sick. But how long had those bacteria been enjoying small-town hospitality? After all, water quality monitoring tends to be at regular intervals rather than on a continuous basis. Sandia researchers are working on a way to improve that picture.

Stephanie vL Henkel
Stephanie vL Henkel

The microChemLab, a handheld "chemistry laboratory," can analyze samples in both the liquid and the gaseous phases to detect toxins and harmful bacteria. Two underlying technologies are involved. The liquid prototype was developed at Sandia's Livermore lab and the gas phase design at the Albuquerque facility. The microChemLab, electronics, and sample collector weigh about 25 lb. and fit into a package the size of a small suitcase. The only external components are the water collectors.

The gaseous phase detector bubbles air through the water sample and collects trihalomethanes from the air. When the collector is heated, the trihalomethanes pass first through a separation column and then over a surface acoustic wave detector. At present the analyzer uses a 4–5 in. dia. commercial separation column, but the plan is to replace it with a 0.52 in. microfabricated version. Doing so will reduce power requirements and enhance performance, according to Curtis Mowry (photo), PI for the Albuquerque project.

Sandia researcher Curtis Mowry prepares to test tap water
Sandia researcher Curtis Mowry prepares to test tap water

Fierce AI Week

Register today for Fierce AI Week - a free virtual event | August 10-12

Advances in AI and Machine Learning are adding an unprecedented level of intelligence to everything through capabilities such as speech processing and image & facial recognition. An essential event for design engineers and AI professionals, Engineering AI sessions during Fierce AI Week explore some of the most innovative real-world applications today, the technological advances that are accelerating adoption of AI and Machine Learning, and what the future holds for this game-changing technology.

Trihalomethanes are undesirable byproducts of the chlorination process in standard use for controlling the bacterial content of water. The microChemLab could be built into a process control loop that would help water utilities limit their initial formation.

The liquid phase detector operates on principles similar to those of the gaseous phase model. The primary difference is at the front end of the device, where separations into distinct bands are accomplished by microchannels coiled onto a glass chip about the diameter of a nickel. Proteins can be identified in a matter of seconds to minutes.

Contact Curtis Mowry, Sandia National Laboratories, Albuquerque, NM; 505-844-6271, [email protected]; or Jay West, Sandia National Laboratories, Livermore, CA; 925-294-3224, [email protected], www.sandia.gov.

Read more on

Suggested Articles

HP leads the pack, but Apple sees 36% surge in notebooks, desktops compared to a year ago

New York City residents moving upstate will give hundreds of towns extra tax revenue to invest in new streetlights with IoT sensors, NYPA foresees

With about one-fifth the revenues of Intel, Nvidia’s market capitalization exceeds Intel’s as Nvidia stock hits record high