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Dissolved organic matter in hand‑dug well water as groundwater quality indicator: assessment using laser‑induced fluorescence spectroscopy and multivariate statistical techniques

机译：用手挖的井水溶解有机物作为地下水质量指示：使用激光诱导的荧光光谱和多变量统计技术进行评估

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摘要

In groundwater, dissolved organic matter (DOM), a complex material, is a contaminant of concern owing to its abilityto influence water quality and stimulate microbial metabolism. Using a 445-nm diode laser-induced fluorescence (LIF)spectroscopy, DOM contamination levels have been investigated of well water samples fetched from ten privately ownedhand-dug wells during dry and wet seasons of 2016, 2017 and 2018, in Ghana. The results showed spatio-temporal heterogeneitiesin the LIF spectra, and the fluorescence intensity peaks were generally higher and broader during the wetseason than the dry season. In this study, DOM fluorescence spectra at an emission wavelength band of 460–650 nmshowed two distinct broad peak shoulders within 480–500 nm and 550–570 nm, engulfing the water Raman peak at527 ± 2 nm for all the water samples studied. Furthermore, principal component analysis and cluster analysis were usedto differentiate the 2016 water samples based on their DOM contamination levels. In each case, three groups or clusterswere identified based on their similarities and dissimilarities. The study revealed humic DOM substances as the mosttypical well water fluorophores. Applying the K-nearest neighbour algorithm as a classifier method for the classificationof 30 water samples studied in 2016, 16.7% (5/30) were classified as very good drinking water, 46.7% (14/30) as good,26.7% (8/30) as fairly good, and 10% (3/30) as bad drinking water samples. In general, levels of dissolved organic mattercontamination increased over the study period during the rainy seasons for wells situated in close proximity to septictanks, refuse dumps, public toilets and in wetlands. Thus, in the study the fluorescence intensity depends on the samplingsite and the season, and indicates the DOM contamination level.
机译：在地下水中，溶解有机物（DOM），复杂的材料是由于其能力的污染物影响水质并刺激微生物代谢。使用445nm二极管激光诱导的荧光（LiF）光谱学，已经研究了从十个私人拥有的井水样本的井水样品研究过在2016年，2016年，2017年和2018年的干燥和湿季期间的手挖井，在加纳。结果表明时空异质性在LIF光谱中，荧光强度峰通常在湿时较高且更宽季节比旱季。在该研究中，DOM荧光光谱在460-650nm的发射波长带上在480-500nm和550-570nm内显示出两个不同的宽峰肩，吞没水拉曼峰值所有水样的527±2nm。此外，使用了主要成分分析和聚类分析根据其DOM污染水平区分2016水样。在每种情况下，三个组或集群是根据其相似性和异化的鉴定。该研究揭示了腐殖质DOM物质典型的井水荧光团。将K-Cirelt邻域算法应用于分类的分类方法方法在2016年研究的30个水样中，16.7％（5/30）被归类为非常好的饮用水，46.7％（14/30），如良好，26.7％（8/30）相当好，10％（3/30）作为饮用水样品差。一般来说，溶解有机物水平污染在雨季的雨季周围靠近腐败术期间增加坦克，垃圾堆，公共厕所和湿地。因此，在研究中，荧光强度取决于取样网站和季节，并表示DOM污染水平。

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  • 来源
    《SN Applied Sciences》 |2020年第5期|834.1-834.15|共15页
  • 作者

    B. Sefa‑Ntiri; B. Kwakye‑Awuah; R. Edziah; B. Anderson; F. A. Armah; P. Mensah‑Amoah; S. S. Sackey; F. Sam; A. G. Akyea; S. Yunus; E. Tatchie; B. K. Nkansah; F. Kumi;

  • 作者单位

    Department of Environmental Science School of Biological Sciences College of Agriculture and Natural Sciences University of Cape Coast Cape Coast Ghana;

    Department of Physics Kwame Nkrumah University of Science and Technology Kumasi Ghana;

    Department of Physics School of Physical Sciences College of Agriculture and Natural Sciences University of Cape Coast Cape Coast Ghana;

    Department of Physics School of Physical Sciences College of Agriculture and Natural Sciences University of Cape Coast Cape Coast Ghana;

    Department of Environmental Science School of Biological Sciences College of Agriculture and Natural Sciences University of Cape Coast Cape Coast Ghana;

    Department of Physics School of Physical Sciences College of Agriculture and Natural Sciences University of Cape Coast Cape Coast Ghana;

    Department of Physics School of Physical Sciences College of Agriculture and Natural Sciences University of Cape Coast Cape Coast Ghana;

    Department of Physics School of Physical Sciences College of Agriculture and Natural Sciences University of Cape Coast Cape Coast Ghana;

    Department of Physics School of Physical Sciences College of Agriculture and Natural Sciences University of Cape Coast Cape Coast Ghana;

    Department of Physics School of Physical Sciences College of Agriculture and Natural Sciences University of Cape Coast Cape Coast Ghana;

    Department of Physics School of Physical Sciences College of Agriculture and Natural Sciences University of Cape Coast Cape Coast Ghana;

    Department of Statistics School of Physical Sciences College of Agriculture and Natural Sciences University of Cape Coast Cape Coast Ghana;

    Department of Agricultural Engineering School of Agriculture College of Agriculture and Natural Sciences University of Cape Coast Cape Coast Ghana;

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  • 正文语种 eng
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  • 关键词

    Dissolved organic matter; Hand-dug well water; Laser-induced fluorescence; Dry and wet seasons; Multivariate statistical techniques; Water quality monitoring and assessment;

    机译：溶解有机物;手挖井水;激光诱导的荧光;干湿的季节;多变量统计技术;水质监测和评估;

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