Enhancing the total organic carbon measurement efficiency for water samples containing suspended solids using alkaline and ultrasonic pretreatment methods

被引:12
作者
Lee, Han-Saem [1 ]
Hur, Jin [2 ]
Shin, Hyun-Sang [1 ]
机构
[1] Seoul Natl Univ Sci & Technol, Dept Environm Energy Engn, Seoul 01811, South Korea
[2] Sejong Univ, Dept Environm & Energy, Seoul 05006, South Korea
来源
JOURNAL OF ENVIRONMENTAL SCIENCES | 2020年 / 90卷
基金
新加坡国家研究基金会;
关键词
Total organic carbon; Suspended solids; Pretreatment; Ultrasonication; Alkaline extraction; SPECTROSCOPIC INDEXES; SLUDGE PRETREATMENT; TOTAL NITROGEN; WASTE-WATER; MATTER; TOC; COASTAL; DIGESTION; OXIDATION; SEDIMENTS;
D O I
10.1016/j.jes.2019.11.010
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
In this study, we investigated the effect of sample pretreatments (ultrasonication and alkaline extraction) on total organic carbon (TOC) measurements for water samples containing suspended solids (SS) of four different origins (algae, soil, sewage sludge, and leaf litter) to more clearly assess the impact of particulate organic carbon (POC) in water. The effects each of ultrasonication (power, pulse, etc.) and alkaline extraction condition (concentration, time, etc.) on the TOC recovery and precision were investigated, and the results were compared with those of a new sample pretreatment method combining both methods. Alkaline treatment (0.01 mol/L NaOH) showed higher precision than ultrasonication (100/5 on/off pulse), and notably, the differences among the measured TOC values in samples of different origins were also further reduced in the alkaline treatment. This suggests that the ultrasonic pretreatment results can be mainly attributed to the increase in POC recovery through particle size reduction, whereas the alkaline treatment results are achieved through the enhancement of POC solubilization. It is also particularly noteworthy that a higher TOC recovery of 87.6% +/- 7.4% with a higher precision of 8.4% could be obtained using the combined method, compared to each treatment (ultrasonic: TOC recovery 34.7%, relative standard deviation 63.1%; alkaline: 49.6% and 23.0%, respectively). Thus, simultaneous pretreatment with ultrasonication and alkaline extraction is expected to increase the oxidation rate of organic matter and the homogeneity of the samples, minimizing the loss of POC measurement values, and thereby improving the reliability of the TOC measurements of water samples containing SS. (C) 2019 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
引用
收藏
页码:20 / 28
页数:9
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