Aris Nor Izzati Fikrah, Rahman Norizah Abdul, Wahid Mohd Haniff, Yahaya Noorfatimah, Abdul Keyon Aemi Syazwani, Kamaruzaman Sazlinda
Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia.
Integrative Medicine Cluster, Advanced Medical and Dental Institute, Universiti Sains Malaysia, 11800 Pulau Pinang, Malaysia.
R Soc Open Sci. 2020 Mar 11;7(3):192050. doi: 10.1098/rsos.192050. eCollection 2020 Mar.
Superhydrophilic graphene oxide/electrospun cellulose nanofibre (GO/CNF) was synthesized, characterized and successfully used in a solid-phase membrane tip adsorption (SPMTA) as an adsorbent towards a simultaneous analysis of polar organophosphorus pesticides (OPPs) in several food and water samples. Separation, determination and quantification were achieved prior to ultra-performance liquid chromatography coupled with ultraviolet detector. The influence of several parameters such as sample pH, adsorption time, adsorbent dosage and initial concentration were investigated. SPMTA was linear in the range of 0.05 and 10 mg l under the optimum adsorption conditions (sample pH 12; 5 mg of adsorbent dosage; 15 min of adsorption time) for methyl parathion, ethoprophos, sulfotepp and chlorpyrifos with excellent correlation coefficients of 0.994-0.999. Acceptable precision (RSDs) as achieved for intraday (0.06-5.44%, = 3) and interday (0.17-7.76%, = 3) analyses. Low limits of detection (0.01-0.05 mg l) and satisfactory consistency in adsorption (71.14-99.95%) were obtained for the spiked OPPs from Sungai Pahang, Tasik Cheras, cabbages and rice samples. The adsorption data were well followed the second-order kinetic model and fits the Freundlich adsorption model. The newly synthesized GO/CNF showed a great adsorbent potential for OPPs analysis.
合成了超亲水性氧化石墨烯/电纺纤维素纳米纤维（GO/CNF），对其进行了表征，并成功将其用于固相膜尖端吸附（SPMTA），作为一种吸附剂用于同时分析多种食品和水样中的极性有机磷农药（OPPs）。在与紫外检测器联用的超高效液相色谱之前实现了分离、测定和定量。研究了样品pH值、吸附时间、吸附剂用量和初始浓度等几个参数的影响。在最佳吸附条件下（样品pH值为12；吸附剂用量为5mg；吸附时间为15分钟），甲基对硫磷、灭线磷、治螟磷和毒死蜱的SPMTA在0.05至10mg/L范围内呈线性，相关系数优异，为0.994 - 0.999。日内分析（n = 3）和日间分析（n = 3）的相对标准偏差（RSDs）分别为0.06 - 5.44%和0.17 - 7.76%，精密度良好。对于彭亨河、蕉赖湖、卷心菜和大米样品中加标的OPPs，检测限低（0.01 - 0.05mg/L），吸附一致性良好（71.14 - 99.95%）。吸附数据很好地符合二级动力学模型，并拟合弗伦德里希吸附模型。新合成的GO/CNF在OPPs分析中显示出巨大的吸附潜力。
