کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8853991 | 1618909 | 2018 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Evaluation of copper toxicity using site specific algae and water chemistry: Field validation of laboratory bioassays
ترجمه فارسی عنوان
ارزیابی مسمومیت مس با استفاده از جلبک های خاص سایت و شیمی آب: اعتبارسنجی آزمایش های زیستی آزمایشگاهی
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم محیط زیست
شیمی زیست محیطی
چکیده انگلیسی
Studies of metal toxicity to microalgae have predominantly been conducted using single non-target algae species and without due regard for the chemistry of the treated waters, leading to ineffective or excessive algaecide treatments. In this study, indigenous multi-algal species (Scenedesmus quadricauda, and Scenedesmus subspicatus and Oscillatoria agardhii) were used in laboratory toxicity bioassays under simulated field water chemistry (pH =â¯7.2, hardness =â¯196â¯mgâ¯Lâ1 as CaCO3, and alkalinity =â¯222â¯mgâ¯Lâ1 as CaCO3) to determine the optimum copper sulfate treatment dose to control algae growth in an irrigation canal. Toxicity bioassays were conducted using copper sulfate in chelated (with EDTA) and non-chelated (without EDTA) forms to assess the influence of the use of synthetic chelators in toxicity studies. Also, copper toxicity to the indigenous algae species was measured in the non-modified EPA test medium (pH =â¯7.5, hardness =â¯92â¯mgâ¯Lâ1 as CaCO3, alkalinity =â¯10â¯mgâ¯Lâ1 as CaCO3 and EDTA=â¯300â¯Âµgâ¯Lâ1) to assess the impact of the water chemistry on algae inhibitory algal dosages. Under simulated water chemistry conditions, lower toxicity was measured in the test flasks with the chelated form of copper (96â¯h- EC50=â¯386.67â¯Âµgâ¯Lâ1 as Cu) as compared to those with the non-chelated metal (96â¯h-EC50=â¯217.17â¯Âµgâ¯Lâ1 as Cu). In addition, higher copper toxicity was measured in the test flasks prepared with the non-modified EPA medium using chelated copper (96â¯h-EC50 =â¯65.93â¯Âµgâ¯Lâ1 as Cu) as compared to their analogous microcosms with modified water chemistry (96â¯h-EC50=â¯386.67â¯Âµgâ¯Lâ1 as Cu), the increased water hardness and alkalinity in the latter case contributing to the decrease of the metal bioavailability. Results from laboratory experiments showed good correlation with copper dosages used in a small scale field testing to control algae growth, increasing confidence in laboratory bioassays.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ecotoxicology and Environmental Safety - Volume 155, 15 July 2018, Pages 59-65
Journal: Ecotoxicology and Environmental Safety - Volume 155, 15 July 2018, Pages 59-65
نویسندگان
Elyssa G. Fawaz, Darine A. Salam, Lina Kamareddine,