At the dated check, the references listed below either did not resolve in
Crossref or DataCite, or carried a retraction notice. Each one is shown with the
registry record that put it there.
The 22 references without a DOI — listed, not checked
no DOI — not checkedAl-Thagafi Z, Arida H, Hassan R (2014) Trace toxic metal levels in canned and fresh food: a comparative study. Int J Innov Res Sci Eng Technol 3:8977–8989
no DOI — not checkedBelay K, Abisa Z (2015) Developing a method for trace metal analysis in spices using spectroscopic techniques: a review. Int J Chem Nat Sci 3:195–199
no DOI — not checkedCodex (2010) Codex General Standard for contaminants and toxins in food and feed 193–1995. [Internet]. Adopted 1995; Revised 1997, 2006, 2008, 2009; [updated 2009, 2010] [cited 2013 Aug 19]. Available from:
http://www.codexalimentarius.net/
download/standards/17/CXS_193e.pdf
no DOI — not checkedCodex Alimentarius-Codex Commission (1998) Codex committee on food additives and contaminants, position paper on tin. Food and Agriculture Organization of the UN.World Health Organization Rome
no DOI — not checkedCodex Alimentarius-Codex Commission (2001) Procedural manual. Food and Agriculture Organization of the UN.World Health Organization Rome
no DOI — not checkedCommission of the European Communities (2005) Commission regulation as regards heavy metals. Amending regulation 466/2001, No: 78/2005
no DOI — not checkedCommission of the European Communities (2006) Commission regulation (EC) 2006/1881/EC of 19 December 2006 replacing regulation (EC) 466/2001 setting maximum levels for certain contaminants in foodstuffs. Off J Eur Commun L 364:5–24
no DOI — not checkedDavid I, Nela ŞM, Balcu I, Berbentea F (2008) The heavy metals analyses in canned tomato paste. J Agroalimentary Process Technol 14:341–345
no DOI — not checkedDospatliev L, Kostadinov K, Mihaylova G, Katrandzhiev N (2012) Determination of heavy metals (Pd, Zn, Cd, Ni) in Egg Plant. Trak J Sci 10:31–35
no DOI — not checkedFAO/WHO (Food and Agriculture Organization/World Health) (1972) Evaluation of certain food additives and the contaminants mercury, cadmium and lead. WHO technical report series, no. 505. WHO, Geneva
no DOI — not checkedFAO/WHO (Food and Agriculture Organization/World Health) (1989) Evaluation of certain food additives and contaminants. WHO technical report series 776, Thirty-Third Report of the Joint FAO/WHO Expert Committee on Food Additives, Geneva, Switzerland
no DOI — not checkedHarmanescu M, Dragan S, Poiana MA, Cioban C, Moigradean D, Gogoasa I, Gergen I (2007) Metals composition of some functional food components: tomato sauce and degreased soy. Lucr St Med Vet. XL Timisoara 40:243–252
no DOI — not checkedKenya Standard (2005) Kenya standard, tomato products-specification, part 3: sauce and ketchup. ICS 67.080.20. KS 39-3:1–4
no DOI — not checkedMAFF (Ministry of Agriculture and fisheries and food) (1995) Monitoring and surveillance of nonradioactive contaminants in the aquatic environment and activities regulating the disposal of wastes at sea. Aquatic environment monitoring report no. 44. Directorate of Fisheries Research, Lowestoft
no DOI — not checkedMajolagbe AO, Kasali AA, Ghaniyu LO (2011) Quality assessment of groundwater in the vicinity of dumpsites in Ifo and Lagos, Southwestern Nigeria. Adv Appl Sci Res 2:289–298
no DOI — not checkedMalakootian M, Tahergorabi M, Daneshpajooh M, Amirtaheri K (2011) Determination of Pb, Cd, Ni, and Zn concentrations in canned fish in southern Iran. Sacha J Environ Stud 1:94–100
no DOI — not checkedNgoddy O, Ihekomonye A (1992) Integrated food science and technology for the tropics, 2nd ed, Macmfflan press Ltd. London 103–136
no DOI — not checkedOgunlana OO, Ogunlana OE, Akinsanya AE, Ologbenlao OO (2015) Heavy metal analysis of selected soft drinks in Nigeria. J global biosci 4:1335–1338
no DOI — not checkedOluwole SO, Olubunmi Makinde SC, Yusuf KA, Fajana OO, Odumosu AO (2013) Determination of heavy metals contaminants in leafy vegetables cultivated by the road side. Int J Eng Res Develop 7:1–5
no DOI — not checkedEast African Standard (2010) East African standard: tomato products-specification-Part 6: tomato sauce. 2010. 2nd ed. EAS 66-6: 2010, ICS 67.080.20, © EAC 2010; p. 1–14
no DOI — not checkedSulyman YI, Abdulrazak S, Oniwapele YA, Ahmad A (2015) Concentration of heavy metals in some selected cereals sourced within Kaduna state, Nigeria. J environ Sci Toxicol Food Technol 9:17–19
no DOI — not checkedUsman B, Kolo BG, Lawan M, Usman YB (2015) Determination of heavy metals and ions in vegetable samples from Wawah and Yimir-Dhalang agricultural areas, Kwaya Kusar local government, Boron stat Ewemen. J Anal Environ Chem 1:14–19
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