Physicochemical properties of the dissolved organic carbon can lead to different physiological responses of zebrafish ( Danio rerio ) under neutral and acidic conditions

2021 ◽  
Author(s):  
Helen Sadauskas‐Henrique ◽  
D. Scott Smith ◽  
Adalberto L. Val ◽  
Chris M. Wood
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Physicochemical Properties ◽  
Danio Rerio ◽  
Physiological Responses ◽  
Acidic Conditions

pH Tolerance and Metal Toxicity in Populations of the Planktonic Diatom Asterionella: Influences of Synthetic and Natural Dissolved Organic Carbon

1993 ◽  
Vol 50 (1) ◽  
pp. 121-132 ◽  
Author(s):  
Robert W. Gensemer ◽  
Ralph E. H. Smith ◽  
Hamish C. Duthie ◽  
Sherry L. Schiff
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Trace Metal ◽  
Humic Lakes ◽  
Ph Tolerance ◽  
Natural Forms ◽  
Acidic Conditions ◽  
Relative Inability ◽  
Culture Growth ◽  
Chemical Conditions

Two clones of Asterionella ralfsii cf americana Körn. were more tolerant of acidic pH with respect to batch culture growth rate than their congener, A. formosa Hass. The relative inability of A. formosa to satisfy trace metal requirements at lower pH appeared to be a major factor in its reduced tolerance of acidic conditions. The pH tolerance of A. formosa, and at times A. ralfsii, also could be modified when grown in media containing different concentrations of artificial or natural forms of dissolved organic carbon (DOC). Mixed trace metal additions (Cu, Zn, Mn, Fe, and Al) further affected pH tolerance in A. ralfsii both by alleviating limitation and by inducing toxicity, depending on the nature and concentration of DOC. Overall, our results were consistent with pH classification schemes for both A. ralfsii and A. formosa as they are commonly used in paleolimnological pH reconstruction models. However, apparent pH classifications for both Asterionella species could be altered by changes in DOC-mediated trace metal bioavailability. Their assignment to a specific pH category or distribution thus may not represent an inherent biological property of that taxon, but may strongly depend on chemical conditions which often vary in humic lakes subject to acid deposition.

CHARACTERISATION OF DISSOLVED ORGANIC CARBON (DOC) LEACHED FROM LEAVES IN WATER

2008 ◽  
Vol 6 (1) ◽  
Author(s):  
Markus Heryanto Langsa
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Total Organic Carbon ◽  
Gas Chromatography Mass Spectrometry ◽  
Pyrolysis Gas ◽  
Pyrolysis Gas Chromatography ◽  
Chromatography Mass Spectrometry ◽  
Pinus Radiate

<p>Penelitian ini bertujuan untuk menentukan senyawa organik khususnya organic karbon terlarut (DOC) dari dua spesies daun tumbuhan (<em>wandoo eucalyptus </em>and <em>pinus radiate, conifer</em>) yang larut dalam air selama periode 5 bulan leaching eksperimen. Kecepatan melarutnya senyawa organic ditentukan secara kuantitatif dan kualitatif menggunakan kombinasi dari beberapa teknik diantaranya Total Organic Carbon (TOC) analyser, Ultraviolet-Visible (UV-VIS) spektrokopi dan pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS).</p><p>Hasil analisis DOC dan UV menunjukkan peningkatan yang tajam dari kelarutan senyawa organic di awal periode pengamatan yang selanjutnya berkurang seiring dengan waktu secara eksponensial. Jumlah relatif senyawa organic yang terlarut tergantung pada luas permukaan, aktifitas mikrobiologi dan jenis sampel tumbuhan (segar atau kering) yang digunakan. Fluktuasi profil DOC dan UV<sub>254</sub> disebabkan oleh aktifitas mikrobiologi. Diperoleh bahwa daun kering lebih mudah terdegradasi menghasilkan senyawa organic dalam air dibandingkan dengan daun segar. Hasil pyrolysis secara umum menunjukkan bahwa senyawa hidrokarbon aromatic dan fenol (dan turunannya) lebih banyak ditemukan pada residue sampel setelah proses leaching kemungkinan karena adanya senyawa lignin atau aktifitas humifikasi mikrobiologi membuktikan bahwa senyawa-senyawa tersebut merupakan komponen penting dalam proses karakterisasi DOC.</p>

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