Determination of chlorophyll derivatives in marine sediments

Chlorophyll Derivatives in Surface Muds From the English Lakes1

“…There is also a marked decrease in absorption bctwecn about 530 and 490 rnp,. The net result of all these changes is that the spectrum comes to resemble closely that for pheophytin n, which Orr and Grady ( 1957) suggest as the main chlorophyll derivative in marine sediments. In this connection it may also be noted that the plankton spectrum illustrated by Vallcntyne ( 1955) b cars a distinct resemblance to those of dead Melosira and pheophytin a.…”

“…Vallentync 1955)) after subtracting an approximate correction factor obtained by drawing a freehand base-line to the absorption curve between 550 and 750 rnp ( cf. Orr and Grady 1957). Aliquots of the muds were then dried at lOO-110°C to allow expression of results on the dry weight basis, and these were used for the estimation of total carbon and total sulfur.…”

Chlorophyll Derivatives in Sediments of the South Philippine Sea, Deep Sea Drilling Project Leg 60

“…The inflection of 690 nm seen here in the absorption spectrum of Sample 460A-1-5, 100-130 cm, fraction 2, has been shown to be due to oxidatively altered chlorins, and much evidence has been gathered to indicate these to be purpurins (viz., purpurin-18, cf., Louda et al, 1980;Baker and Louda, 1980a and b). Absorption at 690 nm has been ascribed to the presence of chlorophyll-d derivatives (Corcoran, 1957;Orr and Grady, 1957). While this is possible, the existence of Rhodophyceae input into these sediments is hardly likely.…”

Seston Composition in Two Fresiiwater Pools

“…In the great depths of ocean water mixing processes may not penetrate sufficiently to resuspend bottom sediment with decaying algae in it. Sinking marine phytoplankton do contain pheo-pigments at depths well below the surface (Yentsch and Ryther 1959;Lorenzen 1965;Yentsch 1965)) as do marine bottom scdimcnts (Orr and Grady 1957;Humphrey 1961).…”