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本文采取K_2 S_2O_8氧化法,研究了氧化条件、紫外分光光度法测定总氮的最佳条件以及可能产生的干扰及消除方法。利用本法测定天然水中总氮回收率100±2%,检出限为0.010mg·dm~(-3)。方法快速准确,与Kjedahl法相比可提高工效27倍。 相似文献
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根据《海洋监测规范》规定的总有机碳分析方法,利用HW-5610非色散红外CO2气体分析仪,设计制造成功总有机碳分析装置,对《海洋监测规范》的方法进行了根本的改进,方法成熟可靠,用该仪器和方法测定TOC,检出限低于0.01mg/L,性优于1%,达到了与进口TOC分析仪相近的分析精度及再现性,而该TOC分析仪的制造成本仅相当于进口仪器价格的1/10-1/5,值得海洋,河流、湖泊等有关监测和研究部门借鉴。 相似文献
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海水中胶体有机碳的测定──高温燃烧法和紫外/过硫酸钾法的比较 总被引:5,自引:0,他引:5
利用切向超滤(cross-flow ultrafiltration)技术对海水中胶体有机碳(COC)和真溶解有机碳(UOC)进行了分离,并分别用高温燃烧法和紫外/过硫酸钾法对胶体有机碳和真溶解有机碳进行了测定。测定结果表明,切向超滤能定量分离海水中的胶体有机碳,高温燃烧法和紫外/过硫酸钾法对胶体有机碳和真溶解有机碳的测定结果没有明显的系统误差,表明这两种方法的氧化效率基本相同,胶体粒子的存在,对紫外/过硫酸钾法的氧化效率没有显着影响。 相似文献
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对测量海水中总溶解氮(TDN)的两种常用方法——高温燃烧法和过硫酸钾氧化法进行了比较。结果表明,两种方法在空白、精密度和准确度实验中不存在显著差异。对不同化合物的回收率均在92%~107%之间,加标回收实验回归曲线的斜率分别为0.93和0.92。对于现场海水样品的测定结果,两个断面拟合的斜率分别为0.92和0.97。HTC法比PO法对实际海水样品的氧化效率略高,在操作上也更方便、快捷。因此,高温燃烧法更适合海水中总溶解氮(TDN)的测定。 相似文献
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Continuous flow analysis of dissolved total phosphorus in seawater by UV-K2S2O8 online digestion method 总被引:1,自引:0,他引:1
Several methods for analysis of dissolved total phosphorus in seawater were reviewed. Discussions were focused on UV irradiation and persulphate oxidation methods which are the most popular dissolved organic phosphorus determination methods presently. The compounds used for the phosphorus recovery test were categorized into three groups according to their chemical structure. It was found that low power UV irradiation can decompose P-O-C or P-C bonds efficiently but may be inefficient for P-O-P bonds. Heating-bath in acid condition is useful for decomposing P-O-P bonds. Using the continuous flow analysis system (Auto-analyzer Ⅱ), UV digestion and heating-bath, series experiments were carried out based on the above analysis. Eleven model compounds were employed for the phosphorus recovery test and the factors influencing the decomposition efficiency of dissolved compounds containing phosphorus were clarified. Finally, the optimal design for determination of dissolved total phosphorus in seawater based on the routine continuous flow analysis system was presented. For the organic mono-phosphate, the recovery is more than 90% and a recovery of 33%~51% was obtained for inorganic or organic polyphosphates. Up to now, this is the highest decomposition efficiency for dissolved phosphorus based on the continuous flow analysis system. 相似文献
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