A new indirect method for the quantification of total organic iodine (TOI) in environmental waters by inductively coupled plasma with mass spectrometry and liquid chromatography with tandem mass spectrometry
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View abstract on PubMed
Summary
This summary is machine-generated.A new method simplifies measuring total organic iodine (TOI), a key indicator of iodinated disinfection by-products (I-DBPs). This approach improves accuracy in environmental water analysis.
Area Of Science
- Environmental Chemistry
- Analytical Chemistry
- Water Quality Analysis
Background
- Iodinated disinfection by-products (I-DBPs) are emerging contaminants linked to organic iodine sources.
- Total organic iodine (TOI) serves as a crucial index for organic iodinated compounds in environmental waters.
- Existing TOI quantification methods are complex, necessitating simpler, more accurate analytical approaches.
Purpose Of The Study
- To develop a simplified and accurate method for measuring total organic iodine (TOI) in environmental waters.
- To overcome limitations of conventional indirect TOI quantification methods that rely on difference calculations.
- To enable precise measurement of inorganic iodine species without redox pretreatments.
Main Methods
- Quantification of total iodine (TI) using inductively coupled plasma mass spectrometry (ICP-MS).
- Simultaneous measurement of inorganic iodide (I-) and iodate (IO3-) using liquid chromatography-tandem mass spectrometry (LC-MSMS) without redox pretreatment.
- Calculation of TOI by subtracting measured inorganic iodine from total iodine.
Main Results
- The developed LC-MSMS method achieved high sensitivity for I- and IO3- with low limits of quantification (0.05 μg I/L for I- and 0.3 μg I/L for IO3-).
- Spiked recoveries demonstrated acceptable accuracy and repeatability for TI, I-, and IO3- measurements in various water matrices.
- The method was successfully applied to determine TOI concentrations ranging from 2.2 to 17 μg I/L in diverse environmental water samples.
Conclusions
- The combined ICP-MS and LC-MSMS method offers a simple, sensitive, and accurate approach for TOI determination.
- This method overcomes the challenges of co-elution and complex pretreatments associated with conventional techniques.
- Accurate TOI measurement is vital for understanding and mitigating the formation of I-DBPs in water treatment.
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