Common Filtering Material Adds Arsenic to Beer

NEW ORLEANSNew research presented at the 245th National Meeting & Exposition of the American Chemical Society revealed using a common material called kieselguhr to filter and clarify some German beers results in elevated levels of arsenic in the beverage. The discovery could be of importance for breweries and other food processors elsewhere that use the same filtering technology implicated in the elevated arsenic levels in some German beers.

A research team led by Mehmet Coelhan, Ph.D., at the Technische Universität in Munich set out to solve that riddle after testing 140 samples of beers sold in Germany as part of a monitoring program. The monitoring checked levels of heavy metals like arsenic and lead, as well as natural toxins that can contaminate grain used in brewing beer, pesticides and other undesirable substances.

Coelhan said the World Health Organization uses 10 micrograms per liter of arsenic in drinking water as a limit; however, some beers contained higher arsenic levels.

When arsenic level in beer is higher than in the water used during brewing, this excess arsenic must come from other sources," he said. That was a mystery to us. As a consequence, we analyzed all materials, including the malt and the hops used during brewing for the presence of arsenic."

They concluded that the arsenic was released into the beer from a filtering material called kieselguhr, or diatomaceous earth, used to remove yeast, hops and other particles and give the beer a crystal clear appearance. Diatomaceous earth consists of fossilized remains of diatoms, a type of hard-shelled algae that lived millions of years ago. It finds wide use in filtering beer, wine and is an ingredient in other products.

We concluded that kieselguhr may be a significant source of arsenic contamination in beer," Coelhan said. This conclusion was supported by analysis of kieselguhr samples. These tests revealed that some kieselguhr samples release arsenic. The resulting arsenic levels were only slightly elevated, and it is not likely that people would get sick from drinking beers made with this filtration method because of the arsenic. The arsenic is still at low levelsthe risk of alcohol poisoning is a far more realistic concern, as stated in previous studies on the topic."

He said beers produced in at least six other countries had higher arsenic amounts than German beers, according to a report published four years ago. Coelhan said breweries, wineries and other food processors that use kieselguhr should be aware that the substance can release arsenic. Substitutes for kieselguhr are available, and simple measures like washing kieselguhr with water can remove the arsenic before use.