Spectrophotometric Detection of Glyphosate in Water by Complex Formation between Bis 5-Phenyldipyrrinate of Nickel (II) and Glyphosate

Abstract

A spectrophotometric method for the determination of glyphosate based on the monitoring of a complex formation between bis 5-phenyldipyrrinate of nickel (II) and the herbicide was developed. The method showed a short response time (10 s), high selectivity (very low interference from other pesticides and salts), and high sensitivity (LOD 2.07 × 10−7 mol/L, LOQ 9.87 × 10−7 mol/L, and a Kd from 1.75 × 10−6 to 6.95 × 10−6 mol/L). The Job plot showed that complex formation occurs with a 1:1 stoichiometry. The method was successfully applied in potable, urban, groundwater, and residual-treated water samples, showing high precision (0.34–2.9%) and accuracy (87.20–119.04%). The structure of the complex was elucidated through theoretical studies demonstrating that the nickel in the bis 5-phenyldipyrrinate forms a distorted octahedral molecular geometry by expanding its coordination number through one bond with the nitrogen and another with the oxygen of the glyphosate’ carboxyl group, at distances between 1.89–2.08 Å.

Analytical methods to analyze pesticides and herbicides

“…A spectrophotometric procedure for glyphosate determination was developed based on the complex formation between bis 5‐phenyldipyrrinate of nickel (II) and glyphosate (Romero‐Natale et al, 2019). The approach was fast and highly sensitive, yielding a low LOD of 2.07 × 10 −7 mol/L and an LOQ of 9.87 × 10 −7 mol/L.…”

Sensitive and Label-Free Colorimetric Detection of Glyphosate Based on the Suppression Peroxidase-Mimicking Activity of Cu(II) Ions

“…Due to the increasingly serious threat of pesticide residues, a number of quantitative detection methods have been reported for the estimation of Glyp, including high-performance liquid chromatography [ 8 ], enzyme-linked immunosorbent assay (ELISA) [ 9 , 10 ], electrochemical method [ 11 , 12 ], and capillary electrophoresis (CE) [ 13 ]. Although these methods can achieve the accurate detection of Glyp, they also have some limitations, such as the time-consuming and laborious process of sample pretreatment and high experimental cost, which cannot meet the needs of facile and rapid detection [ 14 ]. Compared with these analytical methods, colorimetric detection technology has attracted wide attention because of its advantages of simple operation and low cost.…”

Research on near infrared photoelectric response and surface-enhanced Raman scatteringof urchin-like Au-Ag-Pt-Pd nanoalloy

“…全 [10] 、生物医学 [11,12] 和环境监测 [13,14] 等领域. 同时, 由不同金属组成的多金属纳米材料, 通 过调节各金属的相对比例能够获得预期的LSPR 效应 [15−18] , 因此, 多金属纳米复合材料因其各金属 组分之间的协同效应更易于实现其LSPR效应的 可控调节.…”