Wyniki wyszukiwania - Biblioteka Nauki

Nowa wersja platformy, zawierająca wyłącznie zasoby pełnotekstowe, jest już dostępna.
Przejdź na https://bibliotekanauki.pl

Ograniczanie wyników

Znaleziono wyników: 4

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: flameless atomic absorption spectrophotometry

Sortuj według:

Ogranicz wyniki do:

Copper content of milk fat

100%

Rafalowski R. , Zegarska Z.

Polish Journal of Food and Nutrition Sciences

2006

tom 15/56

nr Spec.Issue 1

The study was aimed at determining the content of copper in milk fat. Analyses were carried out on fat extracted from non-pasteurised sweet cream obtained from bulk milk. Copper was extracted from fat samples with nitric acid and its content was determined with the method of flameless atomic absorption spectrophotometry. The results obtained indicate that the content of copper in milk fat ranged from 0.010 to 0.089 mg/kg. The average copper content of fat from the summer feeding accounted for 0.037±0.020 mg/kg, and that of fat from the winter feeding was significantly higher (α=0.05) and reached 0.054±0.021 mg/kg.

Celem niniejszych badań była ocena zawartości miedzi w tłuszczu mlekowym. Badaniom poddano tłuszcz wydzielony metodą ekstrakcyjną z niepasteryzowanej śmietanki otrzymanej z mleka zbiorczego. Miedź ekstrahowano z próbek tłuszczu za pomocą kwasu azotowego, a jej zawartość oznaczano metodą bezpłomieniowej spektrofotometrii atomowej. Uzyskane wyniki wskazują, że zawartość miedzi w tłuszczu mlekowym mieściła się w zakresie od 0,010 do 0,089 mg/kg. Średnia zawartość miedzi w tłuszczu z okresu żywienia pastwiskowego wynosiła 0,037±0,020 mg/kg, a w tłuszczu z okresu żywienia oborowego była istotnie wyższa (a=0,05) i wynosiła 0,054±0,021 mg/kg.

Determination of manganese in cow blood using the flameless atomic absorption spectrophotometry. I. Analytical parameters of the precision and accuracy of the method

86%

Gehrke M. , Lachowski A.

nr 2

A method for blood manganese measurements has been described. The method provides high reproducibility of the concentrations measured. The coefficients of variation were 3.4% and 4.1 % for within-run and between-runs, respectively. The recovery of the method was 98.1 %. Manganese concentrations in the blood ranged from 6.27 ng/ml to 8.98 ng/ml. The measurements revealed that contamination of tubes containing samples and prepared for determination can be the cause of the divergence of the results obtained.

The occurrence of mercury in the Southern Baltic Sea

72%

Brzezinska A.

Oceanologia

1984

tom 18

Determination of manganese in cow blood using the flameless atomic absorption spectrophotometry. II. Population investigations into the variability of manganese concentrations in the serum and blood of cows in various production stages

72%

Gehrke M. , Lachowski A.

nr 2

Statistical analysis of results indicated a significant positive correlation (r = 0.676, P<0.001) between manganese concentrations in serum and blood of cows. Manganese concentration measurements of 147 serum and 117 blood samples from cows in various stages of their production period and fed various manganese levels in their feed were used for determination of the range of reference values. The concentrations of manganese in lactating and drying cows ranged from 1.55 - 4.85 x ng/ml and 1.27 - 3.05 x ng/ml in the serum and from 5.10 ng/mL to 12.35 ng/ml and 4.40 ng/ml to 9.45 ng/ml in the blood, respectively. Analysis of the variance of mean manganese concentrations in the serum and blood revealed that the lowest concentrations of manganese were found in drying cows.