海水化学需氧量烘箱加热测定方法的研究

Determination of seawater chemical oxygen demand by oven heating

在海水化学需氧量(COD)测定中,利用烘箱代替海洋监测规范中的电炉对样品进行加热;探讨了烘箱加热测定法所需的加热条件及其测定范围,并通过实际水样测定了解此法的精确度和准确度。结果表明,烘箱加热测定法具有与海洋监测规范方法同等水平的精确度和准确度,并且在大批量样品测定中具有省时、省电、省力的优点,具有较好的应用价值。

A method for the determination of seawater chemical oxygen demand （COD）, using oven instead of electric furnace to heat samples, was proposed. In this study, standard samples were heated under different conditions of temperature and time to obtain optimum heating conditions. The concentration range of the method was then assessed under the optimum operation conditions. In the end the method was applied to analyze seawater samples in comparison with the electric furnace method. All these results showed a good accuracy and precision of the oven heating method with less time and energy consumed, expecially when a large number of samples were ana- lyzed simultaneously.