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Heavy metal toxicity and metal pair interactions to Lemna minor (Common duckweed)

Başlık çevirisi mevcut değil.

  1. Tez No: 364429
  2. Yazar: EMİNE ŞEMSA NEYLAN DİRİLGEN SARPER
  3. Danışmanlar: PROF. DR. YÜKSEL İNEL
  4. Tez Türü: Doktora
  5. Konular: Çevre Mühendisliği, Environmental Engineering
  6. Anahtar Kelimeler: Belirtilmemiş.
  7. Yıl: 1991
  8. Dil: İngilizce
  9. Üniversite: Boğaziçi Üniversitesi
  10. Enstitü: Çevre Bilimleri Enstitüsü
  11. Ana Bilim Dalı: Çevre Bilimleri Ana Bilim Dalı
  12. Bilim Dalı: Belirtilmemiş.
  13. Sayfa Sayısı: 154

Özet

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Özet (Çeviri)

A search of the literature for evidence concerning the effects of pH on duckweeds has revealed little information. One-third strength Hutner's medium which was reported most extensively in the literature for culturing duckweeds was chosen to investigate the effects of both daily regulated and buffered pH action on the growth of Lemna minor. Daily frond counts were made to detect their growth responses and the results were evaluatod as percentage frond number increase per day. Hesults on daily regulated media confirmed that Lemna minor did not favor alkaline conditions for growth. Consequently, stoadily increasing growth rates were observed between pH 4.0-8.0 .Growth was most successful 011 buffered media at pH levels 6.3-8.0 and Lemna minor had an optimum at about pH 6.8. Nutrient renewal of buffered media in the middle of the test period rosulted in highor growth rates when compared with thH non-renewed media. In Ule second part of Ulis study, Lemna minor was suggested as a promising indicator of aquatic toxicity tests. The effects of cadmium, zinc, cobalt, copper and the coexisting metals such as c8.dmium-zinc, cadmium-copper, copper-cobalt, zinc-cobalt and z.inc-copper 011 the growth and accumulation efficiency of Lemn3 minor were searched on Jacob's media. efficiency of Lernna minor were searched on Jacob's rncc!i.:1. Relative growth rate was defined as the percentage of fresh weight increase per day and the accumulation of the metals were reported in terms of metal incorporated into the frond on dry weight basis. The uptake of metals were determined by Atomic Absorption Spectroscopy after a suitable digestion process. Among the metals tested, cadmium was found to be the most toxic to Lemna minor. Depending on the types of metal pairs tested they showed differing inhibitory and stimulatory effects on the uptake yield by the plant. The presence of copper in the growth medium decreased the uptake of cobalt and cadmium in their separate coexistence. Therefore, antagonism appeared when copper was combined with cobalt and cadmium at equal concentration levels in different treatment sets. However, copper stimulated the uptake of zinc indicaiing that there were synernistic effects when the two were combined. Zinc depressed the uptake of cobalt thus an antagonism was evident. Cadmium increased the uptake of zinc and this result was a syneigistic type effect.

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