Contaminants of emerging concern

Thousands of different compounds are produced and used as part of our daily lives.  Examples include pharmaceuticals (NSAIDs, birth control pills, etc), personal care products (sun screen agents, scents, preservatives, etc), food additives (artificial sweeteners) and compounds used in industrial and commercial applications (flame retardants, antibiotics, etc).  Advances in analytical methods have allowed the detection of many of these compounds in the environment. These compounds are sometimes referred to as contaminants of emerging concern (CECs), and can enter waterways through sources such as filtered wastewater, stormwater and agricultural runoff.  

Overview

Thousands of different compounds are produced and used as part of our daily lives.  Examples include pharmaceuticals (NSAIDs, birth control pills, etc), personal care products (sun screen agents, scents, preservatives, etc), food additives (artificial sweeteners) and compounds used in industrial and commercial applications (flame retardants, antibiotics, etc).  Advances in analytical methods have allowed the detection of many of these compounds in the environment.

CECs include pharmaceuticals and thousands of other commonly used chemical compounds. Photo courtesy of EPA.

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A chemical found in tires is leading to the deaths of untold numbers of coho salmon in Puget Sound every year. Chemical companies are searching for an alternative but say the unique chemistry and function of 6PPD are major challenges. This article is part one of a three-part series.
Formal legal processes are underway in Washington and California to seek alternatives to the highly toxic chemical in tires. We continue with part two of our three-part series on efforts to find a replacement for 6PPD.

With a worldwide market valuation somewhere around $1 billion a year for the single chemical 6PPD, tire companies and their chemical suppliers are working overtime to find a safe and effective replacement for the tire additive. The financial stakes are enormous, since virtually every tire on the market today contains 6PPD.

“The environmental concerns surrounding 6PPD have spurred significant R&D investment in next-generation antiozonants,” states Intelmarket Research, a market-analysis company based in India. “Several manufacturers are developing modified PPD formulations with reduced environmental impact while maintaining performance characteristics. Early adopters of such technologies may gain first-mover advantages in positioning

Increasing concerns surround PFAS in products from wastewater treatment plants. How great a risk do they pose, and are there feasible approaches to removing them? We continue our occasional series on water quality and wastewater management in Puget Sound. Funding for the series is provided in part by King County.
Untold numbers of hatchery fish may be dying from exposure to tire-contaminated runoff, according to a new study.

Finding a replacement for 6PPD in tires is one major challenge; another is to prevent the highly toxic derivative 6PPD-Q from reaching salmon streams and killing fish.