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Wastewater includes liquid waste from residences, industry, and agriculture, comprising a wide range of potential contaminants and concentrations. Industries discharge a variety of pollutants in their wastewater, including heavy metals, organic toxins, oils, nutrients, and solids, all of which endanger ecosystems and pose a threat to human health. In some areas, treated wastewater is recycled for irrigation purposes and even as drinking water. This reuse of water is gaining closer scrutiny as demand increases for water resources.

Treating and recycling wastewater requires careful analysis and monitoring, including the determination of low-level contaminants such as pharmaceuticals and personal care products (PCP's). Dionex HPLC and IC instruments are well-suited to determine a wide range of nonpolar, polar, and ionic contaminants.


The analysis of common anions in environmental water samples is among the most frequently used applications of Dionex ion chromatographs systems.


A key Dionex ion-exchange application is the determination of dissolved alkali and alkaline earth metals and ammonia in drinking water.


Perchlorate (ClO4) has attracted attention within the environmental community as a potentially regulated contaminant, due to concerns that it interferes with iodide uptake in the human thyroid.

Nitrates and Sulfates

Nitrates are toxic compounds that can pose serious risks to human health and the environment. 

Ammonia and Amines

Ion chromatography (IC) can determine inorganic cations and ammonium in a single run.


Dionex provides technology for the efficient extraction and analysis of all 14 explosive compounds listed in EPA SW-846 Method 8330, “Nitroaromatics and Nitramines by HPLC.” 


Surfactants are organic chemicals that reduce surface tension in water and other liquids. The most familiar surfactants are soaps, laundry detergents, dishwashing liquids and shampoos.

PAHs and BNAs

Polycyclic Aromatic Hydrocarbons (PAHs), prevalent in the environment and classified as carcinogenic compounds, are monitored worldwide in a wide range of environmental matrices.

Organic Acids

Dionex offers IC and HPLC solutions for separating organic acids.


The toxicity and persistence dioxins and furans in the environment have generated interest in developing a method for fast, accurate detection in a wide variety of sample matrices.

Selenium and Arsenic

Arsenic is ubiquitous in the environment in the form of inorganic and organic compounds in the trivalent and pentavalent states. Ion chromatography (IC) can separate these metal species according to their valence states.

Hexavalent Chromium

Hexavalent chromium, Cr(VI), is the most toxic form of chromium found in the environment, requiring regulatory monitoring as a primary drinking water contaminant in the U.S.

Cyanide and Metal Cyanide

Cyanide is a regulated inorganic contaminant in drinking and bottled water in the U.S., as enforced by the U.S. EPA and the U.S. FDA Center for Food Safety and Applied Nutrition (CFSAN). 

Pesticides and Herbicides

Pesticides are regulated because the benefits of their use are balanced by the potential risks to human health and the environment due to their toxicity, potency, and persistence in the environment. 


A number of phenols are subject to regulation as air and water pollutants around the world. In the US, eleven phenol compounds are listed as priority pollutants by the U.S. EPA, and five phenol compounds are regulated as hazardous pollutants under the Clean Air Act.


Metals play an instrumental role in almost every facet of our lives, but, when used or disposed of incorrectly, metals can become serious contaminants in soil and water.

Uranium and Thorium

The determination of uranium and thorium can be complicated due interferences present in the sample matrix.