Simultaneous enrichment & on-line detection of low-concentration Copper, Cobalt, & Nickel Ions in Water by Near-Infrared diffuse reflectance spectroscopy combined with chemometrics
Source of Publication
Journal of AOAC International
Sensitive detection of heavy metal ions in water is of great importance considering the effects that heavy metals have on public health. A developed fluidized bed enrichment technique was used to concentrate and detect low concentrations of Cu2+, Co2+, and Ni2+ in water samples by near-IR diffuse reflectance (NIDR) spectroscopy (NIDRS) directly without using any chemicals or reagents. The NIDR spectra of adsorbent were measured on-line, and quantitative detection was achieved by applying a built partial least-squares chemometric model. Sensitivity and accuracy was improved significantly because large-volume mixture solutions were used in the enrichment process. Root mean square error of cross-validation values for Cu2+, Co2+, and Ni2+ were 0.29, 0.41, and 0.35 μg/mL, respectively, with mean relative error values in the acceptable range of 6.56-10.27%. This study confirms the potential application of fluidized bed enrichment combined with NIDRS and chemometrics for the simultaneous detection of trace heavy metal ions in water, with low relative error.
Errors; Heavy metals; Infrared devices; Least squares approximations; Mean square error; Metal ions; Metals; Nickel; Reflection; Trace elements; Chemometric modeling; Enrichment techniques; Near infrared diffuse reflectance; Partial least square (PLS); Quantitative detection; Root mean square errors; Simultaneous detection; Simultaneous enrichment; Fluidized beds; cation exchange resin; cobalt; copper; divalent cation; nickel; water; analysis; chemistry; least square analysis; near infrared spectroscopy; pH; water pollutant; Cation Exchange Resins; Cations, Divalent; Cobalt; Copper; Hydrogen-Ion Concentration; Least-Squares Analysis; Nickel; Spectroscopy, Near-Infrared; Water; Water Pollutants, Chemical
Iqbal, Jibran; Du, Yiping; Howari, Fares M.; Bataineh, Mahmoud; Muhammad, Nawshad; and Rahim, Abdur, "Simultaneous enrichment & on-line detection of low-concentration Copper, Cobalt, & Nickel Ions in Water by Near-Infrared diffuse reflectance spectroscopy combined with chemometrics" (2017). All Works. 3097.
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