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海洋站总氮自动监测仪的研制
王盼盼, 魏福祥, 崔建升, 刘大喜, 何礼
河北科技大学
摘要:
基于海洋监测站人值守自动监测要求,本研究通过控制程序,实现微波-过硫酸盐消解,镉柱还原,流动注射紫外分光光度法连续测定近岸海域海水中总氮。本研究是在设计改进仪器模块的条件下,通过试验,优化测定条件。实验结果证明,海水中总氮浓度与吸光度呈良好线性关系,总氮浓度为0.010~10 mg/L时,线性方程为y=0.185x+0.043,相关系数r=0.9990。标准样品检验,实验相对标准偏差(RSD)为0.89%,样品的加标回收率在98%~102%之间。方法稳定性:零点漂移在±0.5%之内,量程漂移在±3%之内,符合《近岸海域水质自动检测技术规范》(HJ731-2014)要求。该方法测定实际海水样品总氮浓度为0.1927mg/L,与国标法测定结果0.2094mg/L显著性差异。
关键词:  海洋站  总氮  微波消解  流动注射法(FIA)  镉柱还原
DOI:10.11759/hykx20171106001
分类号:X834;
基金项目:国家海洋公益性行业科研专项(项目号:201505007)Foundation item: National Marine public welfare industry research 201505007
The Development of Total Nitrogen Automatic Monitor of Ocean Station
WANG Pan-pan, WEI Fu-xiang, CUI Jian-sheng, LIU Da-xi, HE Li
Hebei University of Science and Technology
Abstract:
Based on the requirement of Marine standing unattended automatic monitoring,a method of determination of total nitrogen in seawater by digestion,cadmium column reduction and flow injection spectrophotometry is described in this paper.Total nitrogen was determined continuously by controlling programin the coastal area.Effects of experimental conditions have been optimized on the premise of improving the instrument parts. Through this method, the experiment measured the total nitrogen has a good linear relationship,in 0.01~10 mg/L, y=0.185x+0.043correlation coefficient r=0.999 0. Standard sample inspection, meet with the national standard "technical specification standard sample determination, the relative standard deviation (RSD)=0.89%, zerodrift within±0.5%, range scatter is within ±3%, the sample of standard addition between 98%~102% recovery, conform to the Specification for automated water quality moniting in coastal area (HJ731-2014).The determination of total nitrogen in seawaters concentration is 0.1927 mg/L and 0.2094 mg/L with national standard method of measurement results.There was no significant difference.
Key words:  ocean  station,total  nitrogen,Microwave  digestion, flow  injection(FIA), cadmium  column reduction
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