Arsenic III & V Speciation

$150.00

In ground water, as well as some surface waters, the most significant inorganic species of Arsenic (As) of concern are Arsenite (As3+) and Arsenate (As5+).

As5+ is easier to remove/filter from than As3+. Therefore, if there is a known quantity of Arsenic in your water, knowing it’s oxidation state is essential information for it’s effective removal.

 

Sample Kit Shipping, Turnaround Time, and Reporting

Once you place your order, you will receive your water testing kit within 5-7 business days. Follow the water sampling instructions included in the kit and return the kit using the pre-paid return shipping label.

Once your sample is received by our laboratory, you will receive your results within 5-working days.

Your analytical data reports are emailed in .pdf format.

Note: The reported analytical data contained within the arsenic speciation water test report are NOT to be used for compliance purpose.

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Common Methods

In natural waters arsenic normally occurs in the oxidation states As3+ (arsenite) and As5+ (arsenate). The removal of As3+ is more difficult than the removal of As5+. Therefore, As3+ has to be oxidized to As5+ prior to its removal. The oxidation rate in the presence of air or pure oxygen is slow. The oxidation rate can be increased by ozone, chlorine, hypochlorite, chlorine dioxide, or H2O2. The oxidation of As3+ is also possible in the presence of manganese oxide coated sands or by advanced oxidation processes.

Arsenic can be removed/filtered by by coprecipitation with Fe(OH)3, MnO2 or during water softening. Other methods include the presence of adsorbents such as activated alumina, ferruginous manganese ore, granular activated carbon, or natural zeolites. Other removal technologies are anion exchange, electrocoagulation, and membrane filtration by ultrafiltration, nanofiltration or reverse osmosis (R/O).

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