Desalination of Hamipterus tianshanensis fossil by electrokinetic method: evaluation for treatment of clay-rich sandstone

Heritage Science

Table 3 The ion content of the segment No. 5 (µg/g)

Number^a	Na⁺	K⁺	Ca²⁺	Cl⁻	NO₃⁻	SO₄²⁻	In total
p1	3003	159	3060	5417	1719	138	13,498
p2	2935	224	2884	5034	1729	212	13,018
p3	3224	229	3057	5826	1938	210	14,483
p4	2544	232	2639	4812	1827	139	12,193
p5	2045	238	3218	4440	1532	141	11,615
p6	2563	374	3657	4803	1807	112	13,316
Average	2719	243	3086	5055	1759	159	13,020
Deviation	422	71	342	495	136	42	1011

^aPowder sample No. p1 from the new surface cut by a saw, powder samples No. p2, p3, and p4 from the original external part of the segment (Fig. 4). Another two powder samples were taken by drilling: powder samples No. p5 and p6 were collected across assembly levels of 0–1 cm and 1–2 cm, respectively, starting from the saw-cut new surface (Fig. 4)