【引用本文】 邵小宇, 张恒, 张书敏, 等. 离子选择电极法测定土壤中水溶性氟提取液温度的控制方式[J]. 岩矿测试, 2021, 40(2): 316-323. doi: 10.15898/j.cnki.11-2131/td.202005120069
SHAO Xiao-yu , ZHANG Heng , ZHANG Shu-min , et al. The Control Mode of Extraction Temperature for Water-soluble Fluorine in Soils Measurement by Selective Electrode Method[J]. Rock and Mineral Analysis, 2021, 40(2): 316-323. doi: 10.15898/j.cnki.11-2131/td.202005120069

离子选择电极法测定土壤中水溶性氟提取液温度的控制方式

1. 南昌海关技术中心, 江西 南昌 330038;

2. 江西省产品质量监督检测院, 江西 南昌 330200

收稿日期: 2020-04-02  修回日期: 2020-10-18 

作者简介: 邵小宇,硕士,工程师,主要从事分析检测和方法研究工作。E-mail:407688689@qq.com。

The Control Mode of Extraction Temperature for Water-soluble Fluorine in Soils Measurement by Selective Electrode Method

1. Technical Center of Nanchang Customs District, Nanchang 330038, China;

2. Jiangxi Province Institute of Produce Quality Supervision & Testing, Nanchang 330200, China

Received Date: 2020-04-02
Revised Date: 2020-10-18

摘要:采用超声提取法对样品进行预处理,利用离子选择电极法测定土壤中的水溶性氟,超声空化热效应会造成提取液温度升高,检测结果不稳定,不能如实反映土壤中水溶性氟含量,对土壤环境中氟的监测造成困扰。因此,选择有效的控制提取液温度方式至关重要。本文通过记录直接超声、加冰袋、加冰水、冷却循环水四种温度控制方式提取液温度变化确定出最佳温度控制方式;选取具有稳定性和代表性的土壤有效态成分分析标准物质测定土壤水溶性氟含量,以验证最佳温度控制方式的合理性和有效性;同时分析了提取过程中提取液pH值变化,探讨温度对土壤中水溶性氟提取量影响的原因。结果表明:冷却循环水温度控制方式可有效将提取液温度控制在25±2℃内,该方式的相对误差(8.9%)明显小于直接超声(14.1%);提取液pH值无明显变化,测定结果稳定可靠。

关键词: 土壤, 水溶性氟, 离子选择电极法, 提取液温度, 控制方式

The Control Mode of Extraction Temperature for Water-soluble Fluorine in Soils Measurement by Selective Electrode Method

KEY WORDS: soil, water-soluble fluorine, ion selective electrode method, extraction solution temperature, control method

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离子选择电极法测定土壤中水溶性氟提取液温度的控制方式

邵小宇, 张恒, 张书敏, 韩颖, 占春瑞, 易明, 江龙发