本文選題：海水　切入點：總磷　出處：《河北科技大學》2016年碩士論文　論文類型：學位論文

【摘要】：總磷總氮是衡量海洋生態(tài)環(huán)境的重要指標,若海洋水體中總磷總氮濃度過高,則會造成水體富營養(yǎng)化等生態(tài)問題,準確測定總磷總氮含量對于海水富營養(yǎng)化預警及保護海洋生態(tài)環(huán)境意義重大。海水中總磷總氮的國標檢測方法操作繁瑣、分析時間長,不能滿足海水中總磷總氮的連續(xù)在線監(jiān)測要求,因此,研發(fā)一套在線快速檢測海水中總磷總氮的自動測定儀,對于提高我國海水水質(zhì)監(jiān)測水平具有重要意義。本研究采用微波-過硫酸鹽消解技術(shù)結(jié)合順序注射-閥上實驗室技術(shù)測定水樣中總磷總氮,并對消解條件、總磷顯色條件及總氮還原、顯色條件進行了優(yōu)化。干擾離子實驗和鹽度干擾實驗表明,海水中主要成分離子和鹽度對本方法測定會產(chǎn)生干擾,可通過配制相應鹽度的系列標準溶液來消除干擾。在最優(yōu)消解、測定條件下,總磷總氮均在0~5 mg·L~(-1)范圍內(nèi)有良好線性,線性相關系數(shù)均為0.999,總磷精密度2.47%,總氮精密度2.39%,總磷檢出限0.0050 mg·L~(-1),總氮檢出限0.0066 mg·L~(-1),總磷加標回收率大于94%,總氮加標回收率大于96%,均符合海水中總磷總氮測定要求。在前期實驗數(shù)據(jù)基礎上,設計完成了總磷總氮自動測定裝置,提出了裝置的系統(tǒng)結(jié)構(gòu)、各部分硬件、裝置系統(tǒng)流程及儀器整體外觀設計圖,為總磷總氮測定儀的研制打下了基礎。
[Abstract]:Total phosphorus nitrogen is an important index to measure the marine ecological environment. If the concentration of total phosphorus nitrogen in marine water is too high, it will lead to eutrophication of water body and other ecological problems. Accurate determination of total phosphorus nitrogen content is of great significance for eutrophication early warning and protection of marine ecological environment. The national standard detection method of total phosphorus total nitrogen in seawater is cumbersome and the analysis time is long. It can not meet the requirement of continuous on-line monitoring of total phosphorus nitrogen in seawater. Therefore, a set of automatic instrument for on-line rapid detection of total total phosphorus nitrogen in sea water has been developed. It is of great significance to improve the monitoring level of sea water quality in China. In this study, the total phosphorus nitrogen in water samples was determined by microwave persulfate digestion technology combined with sequential injection-valve laboratory technology, and the digestion conditions were analyzed. The color reaction conditions of total phosphorus and total nitrogen were optimized. The interference ion experiment and salinity interference experiment showed that the main component ions and salinity in seawater would interfere with the determination of this method. The interference can be eliminated by preparing a series of standard solutions with corresponding salinity. Under the optimum digestion and the determination conditions, the total phosphorus nitrogen has a good linearity in the range of 0 ~ 5 mg 路L ~ (-1). The linear correlation coefficients were 0.999, the precision of total phosphorus was 2.47, the precision of total nitrogen was 2.39, the detection limit of total phosphorus was 0.0050 mg 路L ~ (-1), the detection limit of total nitrogen was 0.0066 mg 路L ~ (-1) ~ (-1), the recovery rate of total phosphorus was more than 944.The total nitrogen recovery was more than 96. Based on the previous experimental data, An automatic total phosphorus nitrogen measuring device is designed and completed. The system structure, the hardware of each part, the system flow and the overall design diagram of the instrument are put forward, which lays a foundation for the development of the total phosphorus total nitrogen measuring instrument.
【學位授予單位】：河北科技大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：X834

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本文編號：1563181