dear editor,<br />I revised some of your previouly edited document as follows. Can you please check if those sentences are ok? thanks<br /><br />
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<li>The nano-TiO<sub>2</sub> concentrations (both &nbsp;in industrial - and the model products driven- ones) in water were determined by measuring the absorbance peak wavelength at 350 nm using spectrophotometer All standard curves involved the use of five concentrations and were linear with regression coefficients greater than 0.995 in all cases.</li>
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<li>The extracted materials contained only n-TiO<sub>2</sub>, as confirmed by energy dispersive spectroscopy (EDS), showing only two elements (Ti and O).</li>
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<li>The concentrations of nano-TiO2 (both industrial- and two products derived ones) were measured using spectrometer as described in the sub-section under &ldquo;materials and nano-TiO2 suspension&rdquo;&nbsp; and the same concentrations of both industrial and products derived nano-TiO2 were exposed to algae afterwards.</li>
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<li>The study by Mueller and Nowack (2008) indicated that the predicted environmental concentrations of nano-TiO<sub>2</sub> in water were less than 20 mg/L, which were still higher than the predicted no effect concentrations of less than 1 mg/L. &nbsp;Nonetheless, our study showcase that the accumulation of nano-TiO<sub>2</sub> over the long-term could end up detrimental effects on the marine environments, while various environmental factors could influence the ultimate fate of nano-TiO<sub>2</sub>. Since there has been lack of data on toxicity over long-term exposure, further study is strongly encouraged to investigate the potential effects of nano-TiO<sub>2</sub> accumulation on marine environments over different time-series under various environmental parameters.</li>
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