Reply: response to letter to the editor

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LETTER TO THE EDITOR

Reply: response to letter to the editor Md. Shafiquzzaman 1 & Husnain Haider 1 & Muhammed Ali Bhuiyan 2 & Abdelkader Tawfeek Ahmed 3,4 & Saleem Saleh Al-Saleem 1 & Abdul Razzaq Ghumman 1 Received: 27 October 2020 / Accepted: 9 November 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020

Dear Editor, This letter is in response to the letter by Professor Dr. Tareq et al. (2020). The letter argued that our paper (Shafiquzzaman M. et.al. 2020, Spatiotemporal variations of DOM components in the Kushiro River impacted by a wetland. Environ Sci Pollut Res 27:18,287–18,302. https://doi.org/10.1007/ s11356-020-08192-7) has some error of WQI calculation. We thank Tareq et al. on identifying the typo errors in our paper. It seems like the team is working on a similar topic and have conducted a state-of-the-art review on DOM components. Identifying the research gap is always required and pushing the state-of-the-art is the basic notion of conducting research on any topic. We thank the team for identifying the typo error regarding Eq. 5. Equation 9 on page 18,291 under the heading “Weight estimation using entropy method” and on page 18,292 under “Step 3: Creation of weighted matrix” is Eq. 5. There is no flaw in weight estimation using the entropy method, except this typo mistake. In addition, at both the locations with this typo mistake, the text clearly directs toward Eq. 5, as this is the only equation to estimate the final weights (Wi), while Eq. 9 generates the negative-ideal solutions for the TOPSIS method. We also accept the typo mistake on page 18,290 “Peak A (Ex./Em. = 260–290/420–460) represents Polyaromatic humic acid (PAHA), whereas peak C (Ex./Em. = 260–290/ Responsible Editor: Philippe Garrigues * Md. Shafiquzzaman [email protected] 1

Department of Civil Engineering, College of Engineering, Qassim University, P. O. Box 6677, Buraidah 51452, Saudi Arabia

2

Civil & Infrastructure Engineering, School of Engineering, RMIT University, Melbourne 3001, Australia

3

Civil Engineering Department, Faculty of Engineering, Aswan University, Aswan, Egypt

4

Civil Engineering Department, Faculty of Engineering, Islamic University, Madinah, Saudi Arabia

420–460) represents poly-carboxylate humic acid (PCHA) (Coble 1996).” The corrected values are as follows: A (Ex./ Em. = 260–290/420–460) and C (Ex./Em. = 330–370/420– 460). However, this was only a typo mistake and was not included in the subsequent calculation. Although non-degradable DOM has more adverse effect than degradable DOM components, when the river water is a drinking water source, the water treatment plant specially the MF- and UF-based treatment would be affected by all the components of DOM as the clogging/fouling of membrane is primarily caused by the dissolved organic matters (Lee et al. 2004; Lee et al. 2008). Also, we have already mentioned that bio-refectory DOM is difficult to treat in water treatment plant (WTP). Moreover, if heavy metals exist in the river water, the components A and C could lead to form organometa

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