Turmeric
The CRM list includes: GBW 08505 – Tea leaves, SRM1573a – Tomato leaves, SRM1515 – Apple leaves, SBMT 02 – Herb mix, LB1 is CRM 8923‐2007 – Birch leaves, and Tr1 is CRM 8922‐2007 – Meadow herbal mix. The sample plants list includes ground coffee, instant coffee, two samples of tea leaves, cinnamon, turmeric, black pepper, pepper paprika, oatmeal, haricot, rice flour, wheat flour, rye and linen flour. The content ranges of some elements in CRMs and the sample plants are, %: Na (0.0024–1.96); Mg (0.095–1.2); Al (0.002–1.0); Si (0.009–1.1); P (0.083–0.6); S (0.097–0.96); Cl (0.023–1.92); K (0.37–4.44); Ca (0.054–5.05); Mn (0.0007–0.12); Fe (0.0056–0.26); Sr (0.0002–0.0345). The element content ranges in real plants are, %: Na (0.003–0.31); Mg (0.08–1.63); Al (0.004–2.37); Si (0.009–15.44); P (0.087–0.45); S (0.06–0.96); Cl (0.01–1.20); K (0.71–5.37); Ca (0.31–21.40); Mn (0.0020–1.2); Fe (0.0083–1.40); Sr (0.0025–0.091). For most elements, the concentration ranges are wider for real plants than comparable CRMs.
Our estimates showed that for analytical lines from Na Kα to Cl Kα, the Irel values were close to the Irel values for Si Kα. The weak dependence of Irel on the chemical composition of the samples used in this case (0.996–1.041, see Table 3.6) confirms the possibility of using an external standard method to calculate concentrations. For Kα lines in the wavelength range Ni Kα to Sr Kα Irel were close to the Irel values for coherently scattered radiation of the Rh Kα ‐line. It follows from the obtained data that with the same contents of the analyzing elements the relative intensities
