scholarly journals Is the consumption of Tilapia zillii and Clarias gariepinus from Edku Lake — El Beheira Governorate —Egypt safe for humans: a physiological and biochemical study and determination of five trace elements

2021 ◽  
Author(s):  
Heba Abdel-Kader ◽  
Mohamed Mourad ◽  
Afaf Mohamed Haredi
Keyword(s):  
Trace Elements ◽  
Trace Element ◽  
Fish Species ◽  
Biochemical Study ◽  
Clarias Gariepinus ◽  
Sod Activity ◽  
Egyptian Government ◽  
Physiological And Biochemical ◽  
The Eu

Abstract The Egyptian government seeks to develop the northern lakes, including Edku Lake in the El Beheira governorate, to enhance the physiological functions of fish, and thus, improve their quality and promote their products. Therefore, this study was performed on the two cheapest fish species T. zillii and C. gariepinus in the Egyptian market, by studying proximate body composition, antioxidant enzyme activity, and bioaccumulation of some trace elements. In this study, T. zillii showed the highest mean of carbohydrates (16.11± 0.67 mg/g), fats (24.21 ± 0.93mg/g), ash (7.33 ±1.00 %), and water content (78.33 ± 1.85 %) whereas, the highest mean of protein content was recorded in C. gariepinus (64.33 ±1.01 mg/g). Antioxidant activity GSH (41.66 ± 2.01mg/g), CAT (21.66 ± 2.6 U/g), GPx (36.5 ± 3.01 mU/L), and GR (41.16 ± 1.0 U/L) in the liver of T. zillii demonstrated insignificant decrease, except GSH and CAT was significant at (p < 0.05). SOD activity showed an insignificant decrease in T. zillii (47±3.5 U/g). Concerning trace element concentrations, C. gariepinus demonstrated an increase in five trace elements than T. zillii. The abundance of the elements is in the order as Hg< Al < Cd <Pb < As in T. zillii and C. gariepinus muscles. The highest As was recorded in C. gariepinus (1.54 ± 0.08 μg/g), whereas, the lowest Hg was recorded in T.zillii (0.47 ± 0.08 μg/g). In this research, the concentrations of the trace element in the two studied fish species were above the limits permitted by EOSQC, FAO/WHO, and the EU'. The estimated weekly intake (EWI) of the elements concentrated in the two fish species was unsafe for young people (40 Kg), and children (15 Kg), whereas it was safe for consumption by adults (70 kg) with advice on safe levels of consumption for C. gariepinus for adults. So, this study recommended that the children should consume less than 16.12857 g/day or 112.90 g/week T.zillii muscle and 13.27 g/day or 92.92 g/week C. gariepinus muscle. Moreover, Youth should consume less than 43.01 g/day or 301.7g/ week T.zillii muscle and 35.39714 g/day or 247.78 g/week C. gariepinus muscle. Finally, adult should consume less than 23.1 g/day and 161.7 g/week T.zillii muscle, and 61.94286 g/day or 433.6 g/week C. gariepinus muscle to maintain their safety.

scholarly journals Influence of TiO2 and ZrO2 nanoparticles deposition on a stainless steel furnace used for trace element determination by TS-FF-AAS

2019 ◽  
Vol 11 (11) ◽  
pp. 1551-1557
Author(s):  
G. Carrone ◽  
D. Onna ◽  
E. Morzan ◽  
R. Candal ◽  
Y. S. Minaberry ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Trace Elements ◽  
Trace Element ◽  
Furnace Wall ◽  
Zro2 Nanoparticles ◽  
Trace Element Determination ◽  
Element Determination ◽  
Steel Furnace ◽  
Nanoparticle Coatings

Improvement of the analytical performance of TS-FF-AAS, for determination of trace elements (Ag, Cd, Pb and Se) in different matrices, by using nanoparticle coatings over the inner furnace wall.

DETERMINATION OF TRACE ELEMENTS IN HUMAN SALIVA BY PIXE TECHNIQUE

1996 ◽  
Vol 06 (01n02) ◽  
pp. 273-276 ◽  
Author(s):  
P. HATAMI ◽  
H. PEYROVAN ◽  
H. AFARIDEH ◽  
S. SHOJAEI
Keyword(s):  
Trace Elements ◽  
Healthy Volunteers ◽  
Trace Element ◽  
Element Concentration ◽  
Trace Element Concentration ◽  
Human Saliva ◽  
Normal Range ◽  
Pixe Analysis ◽  
X Ray

Mineral trace element concentration of human saliva from healthy volunteers, were investigated by Proton-Induced X-ray Emission (PIXE) analysis. The specimens were bombarded with Proton beams of 2 MeV from a Van de Graaff accelerator at NRC . The object of this measurement was to find a normal range of trace element concentration for Iranian people.

Gradient centrifugation to isolate platelets for determination of trace elements by neutron-activation analysis

1990 ◽  
Vol 36 (11) ◽  
pp. 1902-1905 ◽  
Author(s):  
K Bibow ◽  
H H Mundal
Keyword(s):  
Trace Elements ◽  
Neutron Activation ◽  
Trace Element ◽  
Density Gradient ◽  
Gradient Centrifugation ◽  
Trace Element Analysis ◽  
Element Analysis ◽  
Gradient Separation ◽  
Density Gradient Separation

Abstract A nonionic iodinated compound, Nycodenz, was used for density-gradient isolation of platelets before analysis for trace elements by instrumental neutron activation. The platelet samples were almost free from plasma and erythrocytes, and the trace element contribution from additives was insignificant for the elements investigated. The reproducibility of the trace element analysis in platelets attests to the usefulness of density-gradient separation. Platelet samples were obtained twice, three weeks apart, from 10 healthy young women (ages 24 +/- 2 years). The mean (SD) concentrations were as follows: Se, 0.62 (0.16) mg/L and 4.7 (1.4) ng/10(9) platelets; Zn, 44 (10) mg/L and 333 (80) ng/10(9) platelets; Rb, 3.0 (0.5) mg/L and 23 (5) ng/10(9) platelets; and Cs, 24 (5) micrograms/L and 0.18 (0.04) ng/10(9) platelets.

Determination of 28 trace elements in three farmed cyprinid fish species from Northeast China

Food Control ◽  
2015 ◽  
Vol 50 ◽  
pp. 1-8 ◽  
Author(s):  
Dongli Qin ◽  
Haifeng Jiang ◽  
Shuyan Bai ◽  
Shizhan Tang ◽  
Zhenbo Mou
Keyword(s):  
Trace Elements ◽  
Fish Species ◽  
Northeast China ◽  
Cyprinid Fish

Determination of Sulfur, Ash, and trace Element Content of Coal, Coke, and Fly Using Multielement Tube-Excied X-ray Fluorescence Analsis

1976 ◽  
Vol 20 ◽  
pp. 431-436
Author(s):  
J. A. Cooper ◽  
B. D. Wheeler ◽  
G. J. Wolfe ◽  
D. M. Bartell ◽  
D. B. Schlafke
Keyword(s):  
Trace Elements ◽  
Fly Ash ◽  
Trace Element ◽  
Trace Element Content ◽  
Fluorescence Analysis ◽  
Major And Trace Elements ◽  
Average Concentration ◽  
Ash Content ◽  
X Ray

A procedure using tube excited energy dispersive x-ray fluorescence analysis with interelement corrections has been developed for multielement analysis of major and trace elements and ash content of coal, coke, and fly ash. The procedure uses pressed pellets and an exponential correction for interelement effects. The average deviations ranged from about 0.0003% for V at an average concentration of about .003% to 0.1% for S at an average concentration of 4%. About 25 elements were measured and 100 second minimum detectable concentrations ranged from about one part per million for elements near arsenic to about one tenth of one percent for sodium.

scholarly journals Effects of Filter-Membrane Materials on Concentrations of Trace Elements in Acidic Solutions

Water ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 3497
Author(s):  
Woo-Jin Shin ◽  
Hyung-Seon Shin ◽  
Ji-Hun Hwang ◽  
Kwang-Sik Lee
Keyword(s):  
Trace Elements ◽  
Trace Element ◽  
Elemental Content ◽  
Solid Materials ◽  
Polyvinylidene Difluoride ◽  
Membrane Materials ◽  
Acidic Solutions ◽  
Filter Type ◽  
Membrane Type

Filtration is commonly used to separate liquids from solid materials before the determination of trace element concentrations in aqueous solutions. Therefore, it is important to determine how much elemental content is extracted from the filter itself or lost via absorption into the filter. In this study, we investigated three types of disposable syringe filters (polyvinylidene difluoride, PVDF; polytetrafluoroethylene, PTFE; PTFE with glass microfiber prefiltration media, GD/X) and their acid-cleaned versions using ammonium nitrate (NH4NO3) and acetic acid (HOAc) solutions. The concentrations of most trace elements (Li, Al, Cr, Mn, Co, Ni, Cu, Zn, Rb, Sr, Mo, Cd, Cs, Ba, Pb, and U) were higher in filtrates that had passed through acid-cleaned filters than those that had passed through uncleaned filters. In filtrates from PVDF and PTFE filters, many trace elements were below the detection limit. However, regardless of the filter type and acid cleaning, Li, Cu, Zn, Mo, and Ba concentrations in filtrates of NH4NO3 solutions, and Al, Cr, Mn, Cu, Zn, and Ba concentrations in filtrates of HOAc solutions were much higher than those of other trace elements. These differences were particularly noticeable in filtrates from GD/X filters containing glass microfiber layers. These data indicate that certain trace elements can be released from membrane materials by reacting with acid in the filtered solution. Furthermore, the amounts of each trace element were associated with the membrane type. These findings suggest that filter type should be carefully selected to obtain the required accuracy, in consideration of the target elements and whether an acid-cleaned filter is needed.

Gut Sediments in a Burrowing Mayfly (Ephemeroptera, Hexagenia limbata): Their Contribution to Animal Trace Element Burdens, Their Removal, and the Efficacy of a Correction for Their Presence

1989 ◽  
Vol 46 (3) ◽  
pp. 451-456 ◽  
Author(s):  
Landis Hare ◽  
Peter G. C. Campbell ◽  
André Tessier ◽  
Nelson Belzile
Keyword(s):  
Weight Loss ◽  
Trace Elements ◽  
Trace Element ◽  
The Body ◽  
Gut Contents ◽  
Sample Digestion ◽  
No Weight Loss ◽  
Hexagenia Limbata ◽  
Burrowing Mayfly

Nymphs of the burrowing mayfly Hexagenia limbata were collected in the field, returned to the laboratory, and dissected to remove the gut contents. Concentrations of four trace elements (As, Cd, Cu, Zn) were determined both for the gut contents and for the body. Trace elements in gut contents represented up to 22% of whole animal trace element burdens. Studies of depuration of H. limbata nymphs held in water for up to 48 h indicate that individuals vary substantially in the rate at which they egest gut contents and that 48 h is not sufficient to ensure a complete emptying of the gut. A model developed to compensate for the presence of gut contents in the determination of body trace element burdens was applied to H. limbata. Comparisons of model estimates with actual body burdens (without gut contents) show that the model accurately predicts As and Cu concentrations, but overestimates concentrations of Cd and Zn by as much as 20%. We suggest that the biases in the model result from assuming that: (a) trace element concentrations in gut sediments are equivalent to those in sediments sampled from the animal's surroundings, and (b) there is no weight loss of gut contents during sample digestion (a two-thirds weight loss of gut contents was in fact observed). These biases may be minimized by, respectively: (a) measuring trace element burdens of gut contents and (b) compensating for weight loss of gut contents during digestion.

scholarly journals Differential Pulse Polarography Method for the Determination of Trace Fe, Ni, Pb, Zn, Se and Cu in Black Tea Leaves

2020 ◽  
pp. 15-23
Author(s):  
Sukru Kalayc ◽  
Guler Somer
Keyword(s):  
Trace Elements ◽  
Trace Element ◽  
Black Tea ◽  
Differential Pulse ◽  
Differential Pulse Polarography ◽  
Polarographic Method ◽  
Tea Leaves ◽  
Ph Values ◽  
Pulse Polarography

In this work a new and simple polarographic method has been established for the determination of trace elements present in tea. After digestion with acids, tea samples were analyzed using various electrolytes such as acetate and ammonia at different pH values in the presence or absence of EDTA. Thus, it was possible tochoosethe best medium for the determination of6 trace elements in one tea sample. Polarographic peaks of copper and iron could be separated in HAc at about pH =7 in the presence of EDTA and their quantities were determined. Ni and Zn peaks could be separated and determined in ammonia buffer at about pH= 10. Lead could be determined at pH= 2HAc electrolyte. Selenite, was determined from its hydrogen catalytic peak in KCl, pH= 2 medium in the presence of Mo (VI). The LOD was found as 2.4x10-7 for instead of (S/N=3).The trace element ranges in black tea were found as, Fe 35 μg/g, Cu 45 μg/g, Ni 19 μg/g, Zn  22 μg/g, Pb 28 μg/g and Se 77  μg/g.

scholarly journals Trace Element Analysis of Bovine Liver: Interlaboratory Survey in Australia and New Zealand

1980 ◽  
Vol 63 (4) ◽  
pp. 809-813 ◽  
Author(s):  
T S Koh ◽  
T H Benson ◽  
G J Judson
Keyword(s):  
Trace Elements ◽  
New Zealand ◽  
Trace Element ◽  
Trace Element Analysis ◽  
Bovine Liver ◽  
Moisture Determination ◽  
Element Analysis ◽  
Mean Values ◽  
Coefficients Of Variation

Abstract An interlaboratory survey of the determination of trace elements in bovine liver was undertaken. Thirty-three laboratories from Australia and 15 from New Zealand returned results. Moisture determination results were variable despite the use of a recommended drying procedure. For the 10 trace elements determined, the mean values (μg/g) with their interlaboratory coefficients of variation (CV) were: cadmium, 1.2 (42.5%); cobalt, 0.21 (9.5%); copper, 110 (6.0%); iron, 276 (11.0%); lead, 0.6 (48.9%); manganese, 8.6 (13.9%); mercury, 0.03 (30.0%); molybdenum, 2.5 (45.6%); selenium, 1.0 (17.5%); zinc, 219 (8.2%). The intralaboratory CV for determining each of these elements was less than 9% except for the lead CV which was 20.2%. Results for the determination of sodium, potassium, calcium, and magnesium were also reported. The survey shows that while the use of a standard reference material can improve the performance of laboratories in trace element analysis, it may also introduce analytical bias.

Sign in / Sign up

Export Citation Format

Share Document