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Material Database:

INCT-TL-1 Tea Leaves
Type Certified reference material
Producer Institute of Nuclear Chemistry and Technology (INCT/ICHTJ)
Status Available
Material Powder
Reference INCT-TL-1
Catalog (Web) https://www.lgcstandards.com/GB/en/Tea-leaves-Trace-elemen
ts/p/IC-INCT-TL-1
 
Description

 The material was prepared from black tea, usually packed in tea bags. Tea leaves  collected and processed in Argentina were ground and sieved. All precautions were taken to  avoid contamination of the material with metals. The next step was homogenization by mixing in  a plastic drum. After preliminary homogeneity checking by X-ray fluorescence, the material was  distributed into PP bottles and final homogeneity testing was performed by neutron activation  analysis determining Br, Ce, Co, Cr, Cs, Fe, K, La, Mn, Na, Rb, Sc and Sm in subsamples  (Fisher’s test). Good homogeneity of INCT-TL-1 at least for sample weight of 5 mg was  confirmed. Long-term stability has been assured by sterilization of the whole lot of the material  by electron beam radiation and is being monitored during storage. Certification of the candidate  reference material was done on the basis of world-wide interlaboratory comparison exercise in  which 109 laboratories from 19 countries using various analytical methods, participated. Data  evaluation was performed using the software package ACQS-1. Several criteria were  employed to decide whether the overall mean can be given the status of recommended  (certified) or information value. The validity of certified values was confirmed for several  elements using definitive methods developed in this Laboratory. 

Package
50 g

Parameter
Analyte   Aluminum  
Specification   total aluminum  
Parameter   Certified value  
Unit   wt, %  
Result   0.229 ± 0.028  

Analyte   Arsenic  
Specification   total arsenic  
Parameter   Certified value  
Unit   mg/kg (ppm)  
Result   0.106 ± 0.021  

Analyte   Barium  
Specification   total barium  
Parameter   Certified value  
Unit   mg/kg (ppm)  
Result   43.2 ± 3.9  

Analyte   Bromine  
Specification   total bromine  
Parameter   Certified value  
Unit   mg/kg (ppm)  
Result   12.3 ± 1.0  

Analyte   Cadmium  
Specification   total cadmium  
Parameter   Certified value  
Unit   mg/kg (ppm)  
Result   0.030 ± 0.004  

Analyte   Calcium  
Specification   total calcium  
Parameter   Certified value  
Unit   wt, %  
Result   0.582 ± 0.052  

Analyte   Cesium  
Specification   total cesium  
Parameter   Certified value  
Unit   mg/kg (ppm)  
Result   3.61 ± 0.37  

Analyte   Chlorine  
Specification   total chlorine  
Parameter   Certified value  
Unit   mg/kg (ppm)  
Result   573 ± 48  

Analyte   Chromium  
Specification   total chromium  
Parameter   Certified value  
Unit   mg/kg (ppm)  
Result   1.91 ± 0.22  

Analyte   Cobalt  
Specification   total cobalt  
Parameter   Certified value  
Unit   mg/kg (ppm)  
Result   0.387 ± 0.042  

Analyte   Copper  
Specification   total copper  
Parameter   Certified value  
Unit   mg/kg (ppm)  
Result   20.4 ± 1.5  

Analyte   Europium  
Specification   total europium  
Parameter   Certified value  
Unit   mg/kg (ppm)  
Result   0.050 ± 0.009  

Analyte   Lanthanum  
Specification   total lanthanum  
Parameter   Certified value  
Unit   mg/kg (ppm)  
Result   1.00 ± 0.07  

Analyte   Lead  
Specification   total lead  
Parameter   Certified value  
Unit   mg/kg (ppm)  
Result   1.78 ± 0.24  

Analyte   Lutetium  
Specification   total lutetium  
Parameter   Certified value  
Unit   mg/kg (ppm)  
Result   0.017 ± 0.002  

Analyte   Magnesium  
Specification   total magnesium  
Parameter   Certified value  
Unit   wt, %  
Result   0.224 ± 0.017  

Analyte   Manganese  
Specification   total manganese  
Parameter   Certified value  
Unit   wt, %  
Result   0.157 ± 0.011  

Analyte   Mercury  
Specification   total mercury  
Parameter   Certified value  
Unit   mg/kg (ppm)  
Result   0.005 ± 0.0007  

Analyte   Nickel  
Specification   total nickel  
Parameter   Certified value  
Unit   mg/kg (ppm)  
Result   6.12 ± 0.52  

Analyte   Potassium  
Specification   total potassium  
Parameter   Certified value  
Unit   wt, %  
Result   1.70 ± 0.12  

Analyte   Rubidium  
Specification   total rubidium  
Parameter   Certified value  
Unit   mg/kg (ppm)  
Result   81.5 ± 6.5  

Analyte   Samarium  
Specification   total samarium  
Parameter   Certified value  
Unit   mg/kg (ppm)  
Result   0.177 ± 0.022  

Analyte   Scandium  
Specification   total scandium  
Parameter   Certified value  
Unit   mg/kg (ppm)  
Result   0.266 ± 0.024  

Analyte   Sodium  
Specification   total sodium  
Parameter   Certified value  
Unit   mg/kg (ppm)  
Result   24.7 ± 3.2  

Analyte   Strontium  
Specification   total strontium  
Parameter   Certified value  
Unit   mg/kg (ppm)  
Result   20.8 ± 1.7  

Analyte   Sulfur  
Specification   total sulfur (total sulphur)  
Parameter   Certified value  
Unit   wt, %  
Result   0.247 ± 0.025  

Analyte   Terbium  
Specification   Total terbium  
Parameter   Certified value  
Unit   mg/kg (ppm)  
Result   0.027 ± 0.002  

Analyte   Thallium  
Specification   total thallium  
Parameter   Certified value  
Unit   mg/kg (ppm)  
Result   0.063 ± 0.005  

Analyte   Thorium  
Specification   total thorium  
Parameter   Certified value  
Unit   mg/kg (ppm)  
Result   0.034 ± 0.005  

Analyte   Vanadium  
Specification   total vanadium  
Parameter   Certified value  
Unit   mg/kg (ppm)  
Result   1.97 ± 0.37  

Analyte   Ytterbium  
Specification   total ytterbium  
Parameter   Certified value  
Unit   mg/kg (ppm)  
Result   0.118 ± 0.013  

Analyte   Zinc  
Specification   total zinc  
Parameter   Certified value  
Unit   mg/kg (ppm)  
Result   34.7 ± 2.7  








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