Search

Ge, H.; Chen, D.; Li, S.; Zheng, A.; Zhu, Z., and Zheng, X., 2019. Determination of Fe, Ti in seawater using a flow-injection pretreatment system with ICP-MS. In: Guido-Aldana, P.A. and Mulahasan, S. (eds.), Advances in Water Resources and Exploration. Journal of Coastal Research, Special Issue No. 93, pp. 77–82. Coconut Creek (Florida), ISSN 0749-0208. In order to solve the interference caused by low metal concentration and salts matrix of seawater samples, this paper present a handy flow- injection system with solid-phase extraction to automate pretreatment procedures for offline Fe and Ti analysis in seawater by ICP-MS. By combining 8-position, 3-way and 6-way valves in the pipeline, the flow-injection system enhance the sample treatment efficiency by simultaneously loading two reagents online for: sample loading, buffering, and preconcentration. Each sample treatment spends about 16 min and consumes 12 mL of seawater sample and 8 mL of buffer solution. The chelation of Toyopearl-AF-Chelate-650M for Fe and Ti occurs in pH5.5 at an injection rate of 1.0 mL·min-1. The eluent (0.8 mol·L-1 HNO3) is able to elute Fe and Ti in 90 s at an elution rate of 1.0 mL·min-1. Seawater sample needs 90 min of 120 W UV-oxidation to dissociate metal-organic complexes. The precision and availability of this method are tested by measuring Jiulongjiang Estuary seawater samples. [ABSTRACT FROM AUTHOR]

Ge, H.; Chen, D.; Li, S.; Zheng, A.; Zhu, Z., and Zheng, X., 2019. Determination of Fe, Ti in seawater using a flow-injection pretreatment system with ICP-MS. In: Guido-Aldana, P.A. and Mulahasan, S. (eds.), Advances in Water Resources and Exploration. Journal of Coastal Research, Special Issue No. 93, pp. 77–82. Coconut Creek (Florida), ISSN 0749-0208. In order to solve the interference caused by low metal concentration and salts matrix of seawater samples, this paper present a handy flow- injection system with solid-phase extraction to automate pretreatment procedures for offline Fe and Ti analysis in seawater by ICP-MS. By combining 8-position, 3-way and 6-way valves in the pipeline, the flow-injection system enhance the sample treatment efficiency by simultaneously loading two reagents online for: sample loading, buffering, and preconcentration. Each sample treatment spends about 16 min and consumes 12 mL of seawater sample and 8 mL of buffer solution. The chelation of Toyopearl-AF-Chelate-650M for Fe and Ti occurs in pH5.5 at an injection rate of 1.0 mL·min-1. The eluent (0.8 mol·L-1 HNO3) is able to elute Fe and Ti in 90 s at an elution rate of 1.0 mL·min-1. Seawater sample needs 90 min of 120 W UV-oxidation to dissociate metal-organic complexes. The precision and availability of this method are tested by measuring Jiulongjiang Estuary seawater samples. [ABSTRACT FROM AUTHOR]

A determination method for metalaxyl(MEL) residues in watermelon and banana had been established by automated solid-phase extraction(SPE) coupled with high performance liquid hromatography(HPLC). Samples were extracted by acetonitrile, homogenized, filtrated, extracted by automated solid-phase extraction(SPE), and finally purified by C18 column. The experiment was carried on SunFireTM C18 column with the mobile phase of acetonitrile-water-methanol(25:40:35, by vol) at the flow rate of 1.0 mL/min. The detection wavelength and injection volume were set at 220 nm and 10 uL, respectively. The recoveries of three different concentrations(0.02, 0.20, 1.00 mg/kg) for watermelon and banana were 94.3%-101.0% and 81.5%-99.6%, respectively. RSD(n = 5)were 1.30%-5.29% and 2.66%-6.67%, respectively. The lower detection limit for metalaxyl was 0.006 mg/kg. This method met with the requirements of pesticide residue detection. [ABSTRACT FROM AUTHOR]