Producing Laboratory: MESL
Vendor: IAEA
Availability: In stock
Tuna Homogenate

​A sample of Tuna (Thunnus thynnus) was collected from the Mediterranean Sea in 2004. This sample was freeze-dried, ground, and sieved at 250 μm. The powder was homogenized and aliquots of about 30 g were packed into glass bottles to produce the IAEA-435 reference material. More details about the preparation of this reference material are provided in reference [INTERNATIONAL ATOMIC ENERGY AGERNCY, World-wide intercompari​​​son exercise for the determination of organochlorine compounds and petroleum hydrocarbons in tuna homogenate IAEA-435, IAEA/AL/163, IAEA, Vienna (2006)). New homogeneity and characterization studies were performed on the IAEA-435 material to become IAEA-435A​

Certified mass fraction values  

PCB congeners 

(Based on dry mass) 

AnalyteUnitCertified value⁽ᵃ⁾Expanded uncertainty⁽ᵇ⁾
PCB 28µg kg⁻¹1.320.45
PCB 31µg kg⁻¹0.610.15
PCB 52µg kg⁻¹3.970.83
PCB 101µg kg⁻¹23.44.8
PCB 105µg kg⁻¹8.31.8
PCB 118µg kg⁻¹28.05.3
PCB 138µg kg⁻¹7215
PCB 149µg kg⁻¹27.75.6
PCB 153µg kg⁻¹9416
PCB 156µg kg⁻¹3.850.73
PCB 170µg kg⁻¹11.82.2
PCB 180µg kg⁻¹34.26.4
PCB 187µg kg⁻¹32.88.9
PCB 194µg kg⁻¹3.840.77

Certified mass fraction values  

Chlorinated pesticides 

(Based on dry mass) 

AnalyteUnitCertified value⁽ᵃ⁾Expanded uncertainty⁽ᵇ⁾
HCBµg kg⁻¹2.650.66
pp’-DDDµg kg⁻¹13.63.4
pp’-DDEµg kg⁻¹13426
pp’-DDTµg kg⁻¹18.34.0
op'-DDEµg kg⁻¹2.100.56
op'-DDDµg kg⁻¹2.670.69
op'-DDTµg kg⁻¹7.21.8
Dieldrinµg kg⁻¹5.51.6
cis-Chlordaneµg kg⁻¹7.12.1
trans-Nonachlor µg kg⁻¹20.24.6


Certified mass fraction values  

PBDE congeners 

(Based on dry mass) 

AnalyteUnitCertified value⁽ᵃ⁾Expanded uncertainty⁽ᵇ⁾
BDE 28µg kg⁻¹1.260.25
BDE 47µg kg⁻¹22.93.9
BDE 66µg kg⁻¹2.480.50
BDE 99µg kg⁻¹1.440.29
BDE 100µg kg⁻¹7.31.3
BDE 153µg kg⁻¹0.700.16
BDE 154µg kg⁻¹5.01.1

(a) Information on calculation of certified values 
Certified values are calculated from the accepted data sets, each set being obtained by a different laboratory and/or a different method of determination following ISO Guide 35 [1]. 

(b) Information on uncertainty estimation 
The uncertainty is expressed as an expanded uncertainty with a coverage factor k = 2 estimated in accordance with the JCGM 100:2008 [2] and ISO Guide 35 [1]. 


The values li​​​sted above were established on the basis of statistically valid results submitted by laboratories which had participated in an international interlaboratory comparison organized by the IAEA Marine Environment Laboratory, Monaco. The details concerning the criteria for qualification as a recommended or information value can be found in the respective report (attached).


[1] INTERNATIONAL ORGANIZATION FOR STANDARDIZATION, Reference materials — Guidance for characterization and assessment of homogeneity and stability, ISO Guide 35:2017, ISO, Geneva (2017). 


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