| value | technique | year | title_of_literature<MAX120col.> | journal<MAX120col.> | vol | page | name<MAX80col.> |
| 0.80 | FLUOR |
1989.05 | Fluorimetric determination of thallium in silicate rocks with rhodamine B after separation by adsorption on a crown ether polymer | Analyst | 114 | 615-617 | H.Koshima and H.Onishi |
| 0.610 | AA |
1989.1 | Determination of thallium in eighty-seven geochemical reference samples by atomic absorption spectrometry | Geost. Newsletter | 13 | 277-281 | S.Terashima |
| 0.61 | AA |
1990.04 | Elemental concentrations in nine new GSJ rock reference samples 'sedimentary rock series' | Geost. Newsletter | 14 | 1-5 | S.Terashima, A.Ando, T.Okai, Y.Kanai, M.Taniguchi, |
| 0.51 | ICPMS |
1993.04 | Simultaneous determination of thirty-seven trace elements in twenty-eight international rock standards by ICP-MS | Geost. Newsletter | 17 | 81-97 | CD.Garbe-Schonberg |
| 2 | OES |
1999 | Personarl Communication, Institute of Geology, Estonia | | | | T. Kiipli |