Analysis of the results obtained for proficiency testing schemes in laboratories for food control in Institute of Public Health, Skopje, FYROM

Kostik, Vesna and Memeti, Shaban and Mickov, Toni and Kiroska-Petreska, Evgenija (2011) Analysis of the results obtained for proficiency testing schemes in laboratories for food control in Institute of Public Health, Skopje, FYROM. In: 7th Workshop proficiency testing in analytical chemistry, microbiology and laboratory medicine (EURACHEM) - Current practise and future directions, 3-6 Oct 2011, Istanbul, Turkey.


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Within the period of 9 years (2002 – 2010) in the laboratories for food testing in Institute of Public Health, Skopje, FYROM, 32 different proficiency tests were performed in 23 different matrixes as: coffee cream, cream, powdered milk, yoghurt butter; oily dressing, cola drink, cabbage puree , fresh cheese , orange juice, potable water, water real sample, animal feed cereal based, fish oil, maize flour, corn flakes, minced canned fish, graham flour, synthetic food of vegetable and animal origin, homogenized canned fruit, powdered rice, dietetic product, fish soup and fresh fish. The number of parameters which were analyzed was 73 as: fat content, dry matter, water content, benzoic acid, nitrate content, caffeine, saccharine, K – acesulfame., protein content, pH, citric acid, fructose, glucose, sucrose, total sugars, aflatoxins (B1; B2 G1; G2;), trihalomethanes (chloroform; bromoform; carbon tetrachloride; trichloroethene and tetrachloroethene), organophosphorus insecticides (etrimfos; fenitrothion; malathion; pirimiphos–methyl; azinphos-methyl; dichlorvos; chlorofenvinphos; parathion-ethyl; parathion-methyl; chlorpiryfos; diazinon and mevinphos), organochlorine insecticides (endrin; dieldrin; aldrin; pp’DDT; lindane; endosulfan I; endosulfan II; HCH; heptachlor; heptachlor epoxide; cis chlordane and pp’DDE), herbicides (alachlor; trifluralin; atrazine; propazine and simazine), metals (lead; cadmium; zinc; copper; chromium; iron; manganese; cobalt; nickel; mercury and arsenic), routine components in water (pH; turbidity; colour; conductivity at 200 C; SR phosphate; ammonium; PI; nitrate; nitrite; sulphate; chloride; fluoride; alkalinity; total hardness; calcium; sodium; potassium and magnesium). The number of measurements which were performed was 203. The following results for Z score were obtained: 159 results had Z score Z < 2 (78.33 %); 17 results had Z score 2< Z < 3 (8.37 %) and 27 results had Z score Z > 3 (13.30%). Analysis of the possible sources of error for Z score 2<Z <3 have shown that it is due to random error during analysis. The highest values of Z scores were obtained for the analysis of fatty food (content of fat and dry matter). The best values of the Z score were obtained for the trace metals analysis and pesticides residues analysis. Providers for chemical testing of food and water were: Muva Kempten Quality Management & Laboratory Services; DRRR Deutsches Referenzbüro für Lebensmittel-Ringversuche und Referenzmaterialien; FAPAS and LEAP (UK) and The Swedish National Food Administration (NFA). Keywords: laboratory, proficiency, Z score

Item Type: Conference or Workshop Item (Poster)
Subjects: Medical and Health Sciences > Other medical sciences
Divisions: Faculty of Medical Science
Depositing User: Vesna Kostik
Date Deposited: 20 Jan 2015 14:15
Last Modified: 20 Jan 2015 14:15

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