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| 1 | Enhancing the total organic carbon measurement efficiency for water samples containing suspended solids using alkaline and ultrasonic pretreatment methods显示文摘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 pre treatment 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. | Han-Saem Lee Jin Hur Hyun-Sang Shin | 2020 | Journal of Environmental Sciences2020，32，4： | 1 |
| 2 | 上海汽车制造业总有机碳与VOC排放特征研究显示文摘采用燃烧氧化-非分散红外吸收法,建立了固定污染源中总有机碳的测定方法。采集并分析了上海市汽车制造业喷涂车间总有机碳(TOC)的浓度,并与现行排放标准进行了比较。结果表明,标准曲线的线性较好,精密度较高,方法检出限为9.0 mg/m^3;所测气样中TOC浓度在色漆工艺为75.1 mg/m^3,中漆工艺为86.1 mg/m^3,清漆工艺为224.5 mg/m^3,中涂烘房为92.1 mg/m^3。将同批次样品的TOC浓度与VOC浓度进行比较,发现在不同车间工艺中,TOC浓度最高,VOC浓度次之,TOC浓度一定程度上可以反映VOC的浓度。 | 孙嘥琳 | 2016 | 广州化工2016，44，24： | 0 |
| 3 | 餐厨垃圾超临界水气化固/液副产物特性研究显示文摘对不同气化温度、气化时间下,餐厨垃圾超临界水气化固相副产物的燃烧特性和液相副产物碳分布特性进行了研究。分析结果表明:固相副产物热值为20.9~36.0 MJ/kg,液相总碳浓度为3 947~5 286 mg/L;随着超临界水气化温度(420~500℃)提高,固相副产物着火点呈下降趋势(489.4~406.0℃),最大燃烧失重速率点温度为607、591、608℃,同时液相副产物的总有机碳(TOC)含量下降(4 392~2 695 mg/L);500℃超临界水下随着气化时间(20~60 min)增加,固相副产物着火点呈上升趋势(406.0~508.4℃),最大燃烧失重速率点温度分别为608、610、591℃,同时液相副产物TOC含量下降(2 695~1 965 mg/L)。电煤混合固相副产物后,着火点温度和最大燃烧失重速率点温度均上升。当固相副产物与电煤的混合比例达到1∶2时,最大失重速率最高,燃烧效果最好。另外,在500℃气化温度和60 min气化时间的条件下,气相热值最高(13.42 MJ/m^3),得到的液相副产物的有机碳含量最低,有利于后续处理。 | 金俊杰 赵铖力 苏红才 冯闳宇 Dwi Hantoko 严密 | 2020 | 环境卫生工程2020，28，4： | 0 |
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