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MnO2纳米棒检测木制品中五氯苯酚

2021-09-13封亚辉吴成媛查燕青严文勋许仁富张秀戴东情

中国测试 2021年12期

封亚辉 吴成媛 查燕青 严文勋 许仁富 张秀 戴东情

摘要:五氯苯酚作为一种重要的木材防腐剂,同时也具有强致癌性,为严格控制其用量,研究建立一种木制品中五氯苯酚的电化学检测方法。利用水热法,合成具有良好催化活性的 MnO2纳米棒。利用 MnO2纳米棒修饰丝网印刷电极,研究五氯苯酚在 MnO2纳米棒修饰丝网印刷电极上的电化学行为。对缓冲液 pH、MnO2修饰浓度以及修饰量进行优化,结果表明在 Tris-HCl 缓冲溶液 pH 为7、MnO2纳米棒修饰浓度为1 mg/mL、修饰量为5μL 时,其催化活性最好。在最佳试验条件下,对五氯苯酚的含量进行测定,在0.1~80 mg/L 浓度范围内与对应的峰电流呈良好线性关系,检测限为0.028 mg/L,可用于木制品中五氯苯酚的快速检测。

关键词: MnO2纳米材料;电化学检测;五氯苯酚

中图分类号: O657文献标志码: A文章编号:1674–5124(2021)12–0052–06

Detection of pentachlorophenol in wood product based on MnO2 nanomaterials

FENG Yahui1,WU Chengyuan2,ZHA Yanqing1,YAN Wenxun1,XU Renfu1,ZHNAG Xiu1,DAI Dongqing1

(1. Nanjing Customs District Industrial Products Inspection Center, Nanjing 210009, China;2. School of Food andPharmaceutical Engineering, Nanjing Normal University, Nanjing 210023, China)

Abstract: Pentachlorophenol is an important wood preservative which should be used under strictly control due to its strong carcinogenicity, so an electrochemical method for the determination of pentachlorophenol in wood product was established. The MnO2 nanorods was synthesized by hydrothermal method, which showed goodcatalyticperformance. Inordertorealizetherapiddetectionmethodofpentachlorophenol,the electrochemical behavior of pentachlorophenol wasstudied by using the MnO2 nanorods modifiedscreen- printed electrode. By optimizing the buffer pH, MnO2 nanorods concentration and MnO2 nanorods modification amount, the results showed that the best catalytic activity was obtained at the condition of Tris-HCl buffer (pH 7.0),MnO2 nanorods (1 mg/mL, 5μL). Undertheoptimumexperimentalconditions,thecontentof pentachlorophenol can be determined. The proposed sensor had a well linear relationship in the range of 0.1 to 80 mg/L with a detection limit of 0.028 mg/L. Moreover, the analysis of pentachlorophenol in real sample revealed that the proposed biosensor has a promising application in wood product testing.

Keywords: MnO2 nanorods; electrochemical detection; pentachlorophenol

0引言

五氯苯酚(pentachlorophenol,PCP)是一種重要的防腐剂,用于阻止真菌的生长、抑制细菌的腐蚀作用,被广泛用作室内和室外房屋建筑中的木材防腐剂;也可用于棉花和羊毛等天然纤维在储存和运输过程的防腐;也可用作印花浆料防腐防霉的稳定剂,用于纺织品加工[1-4]。它不仅具有很强的致癌、致畸以及致突变效应,而且在燃烧时会释放出二噁英类化合物,对环境造成持久性损害,被包括我国在内的许多国家列入优先污染物和持久性有机污染物的黑名单[5-6]( https://lunwen.7139.com/400/28/167568.html)。同时,由于五氯苯酚稳定的卤代芳族环结构和高氯含量,其生物降解速度相对较慢。相关研究表明五氯苯酚广泛使用已导致环境污染和对人体内分泌的干扰,残留在木制品中的五氯苯酚会随着其对人体皮肤的接触而迁移至人体内,造成生物累积,危害人类健康[7-8]。……

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