Many people consume raw seaweeds and I'm working on seaweeds.
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[I]The sea weeds collected from Newzeeland are found to be the cleanest.
[II] THERE ARE A NUMBER OF VARITIES OF SESWEEDS and thus all are reported.
[III] The recommended dietary limit by WHO is also reported.
For human consumption you can use the WHO maximum concentrations of heavy metals described for any vegetable or even animal since its not the food that matter but its metal burden
The reported key heavy metals in green, brown and red algae are in the following range from the Egyptian coasts (Abdallah et al. 2005)
Cadmium: .0.4-10 mg/kg (green algae); 0.8-6.6 mg/Kg (brown algae); 0.4-10.4 mg/kg (red algae)
Lead: 5.7-49.8 mg/kg (green algae); 3.1-38.9 mg/Kg (brown algae); 3.2-50.5 mg/kg (red algae)
Zinc: 4.6-69.7 mg/kg (green algae); 2-74.8 mg/Kg (brown algae); 2.4-90.4 mg/kg (red algae)
Copper: 3.1-17.3 mg/kg (green algae); 0.6-10.7 mg/Kg (brown algae); 0.7-11.4 mg/kg (red algae)
Reference
A. M. A. Abdallah , M. A. Abdallah & A. I. Beltagy (2005) Contents of heavy metals in marine seaweeds from the Egyptian coast of the Red Sea, Chemistry and Ecology, 21:5,399-411, DOI: 10.1080/02757540500290222. http://www.tandfonline.com/doi/abs/10.1080/02757540500290222?journalCode=gche20#preview
Hi, the best reference for me to get a good overview of trace elements in marine algae and plant are the following...values depends of the element, the species, the location (pristine or contaminated).
Eisler R (2009) Compendium of Trace Metals and Marine Biota Volume 1: Plants and Invertebrates. ISBN: 978-0-444-53436-1
This book has two main goals :
1. Determine baseline concentrations of metals and metalloids in tissues of representative field populations of estuarine coastal, and open ocean organisms (Book 1:algae and macrophytes, protists, sponges, coelenterates, molluscs, crustaceans, insects, chaetognaths, annelids, echinoderms, and tunicates) and their significance to organism health and to the health of their consumers.
2. Synthesize existing information on biological, chemical, and physical factors known to modify uptake, retention, and translocation of each element under field and laboratory conditions. Recognition of the importance of these modifiers and their accompanying interactions is essential to the understanding of metals kinetics in marine systems and to the interpretation of baseline residue data.
All the best,
MM
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