摘要
在0.010 mol/L HCI-1.0 mol/L NaCl溶液中,用邻苯二甲酸二异辛酯、光谱纯石墨粉制成的碳糊电检测Fe(Ⅲ),线性范围为8× 10^(-7)～3×10^(-4)mol/L,响应斜率为110mV/decade,检测限为2.5×10^(-7)mol/L。该法具有选择性好、分析速度快、成本低等特点,可用于水样中Fe(Ⅲ)的测定,电位的响应是由碳表面的化学吸附引起的。
The carbon paste electrode made of a mixture of di-iso-octyl phthatate and spectroscopic graphite powder is used to determine the content of Fe(Ⅲ) in 0.010 mol/L HC1-1.0 mol/L NaC1(pH=2.0), with the following results: linear range, 8×10^(-7)~3× 10^(-4) mol/L; calibration slope, 110 mV/decade and detecion limit 2.5×10^(-7) mol/L. This method is characterized by high selectivity, high speed and low cost. The potential response be- havior is chiefly caused by chemisorption of Fe(Ⅲ) to the surface of the carbon.
基金
江苏省教委自然科学基金
关键词
离子选择性电极
碳糊电极
铁离子
化学传感器
Potentiometry
Chemical sensor
Ion-selective electrode
Carbon paste electrode
Iron ion
