Application of nano magnesium titanate used as solid-phase extraction adsorption medium in heavy metal ion enrichment

Abstract

The invention relates to an application of nano magnesium titanate used as a solid-phase extraction adsorption medium in heavy metal ion enrichment, which is characterized by sucking a sample liquid with a syringe, adjusting the pH value to more than 5 with ammonia water, passing through a solid-phase extraction column at a flow rate v not larger than 20 mL / min, washing the column with 50 mL of water, eluting the analyte with 5-10mL of 2 moL / L nitric acid, collecting in a test tube and detecting the content of heavy metal ions in the eluate with an AAS (atomic absorption spectrophotometer) or ICP (inductively coupled plasma) method. The invention uses nano magnesium titanate as a solid-phase extraction adsorption medium to apply in heavy metal ion enrichment, has the advantages of low cost, large adsorption capacity, high enrichment factor, stable enrichment performance, good strong acid, strong base and organic solvent resistance, good high-temperature resistance and reusability, and can simultaneously enrich Pb, Cd, Zn, Cu, Ni and other heavy metal ions.

Description

technical field [0001] The invention relates to a new application of nano-magnesium titanate, in particular to the application of nano-magnesium titanate in heavy metal enrichment, and belongs to the field of pre-enrichment of trace substances in analytical chemistry and environmental monitoring. Background technique [0002] With the rapid development of modern industry, a large amount of pollutants enter the environment, causing serious environmental problems. Among the many pollutions, heavy metal pollution is one of the most serious pollutions. Heavy metals are not only highly toxic, but also concealed, irreversible and long-term. They can accumulate in organisms and amplify their toxicity through bioaccumulation in the food chain. All countries in the world have made strict regulations on the content of heavy metals in water and food. At present, the determination of heavy metals mainly uses atomic absorption method, spectrophotometry and ICP method. Although the sens...

AI Technical Summary

Problems solved by technology

However, as an important member of the nanomaterial family, nano-magnesium titanate is currently only used to manufacture thermally stable ceramic capacitors and microwave dielectric resonators, etc.

However, it has not been reported that it is used as a solid-phase extraction agent for the simultaneous enrichment of multiple heavy metals in water.