[Retracted] Technical Level Assessment Method of Digital Silk Road Development Based on Intelligent Algorithm

Table 2

Determination results of water samples in main water bodies along the Silk Road Economic Belt (U//).

Water quality parameters	Upper Volga River	Middle Volga River	Lower Volga River	Romanian section of Danube River	Iran section of Caspian Sea	Black Sea	Mediterranean Sea	Tonglingsection of Yangtze River
Cd	0.09–0.21	<0.02–0.62	0.02–0.27	<0.026	—	—	—	0.21–0.09
Pb	0.03–0.09	—	1.00–3.3	0.03–0.11	7.15	19.57	25.87	0.96–3.85
Al	190.0–400.0	8.3–71.1	440.0–1482.0	—	—	—	—	—
Sr	84.9–122.0	95.87–288.0	468.0–568.0	—	—	—	—	—
Mn	73.0–150.0	13.0–112.0	22.8–35.8	—	—	—	—	—
Zn	1.30–5.50	<1.00–5.12	2.61–8.80	0.09–0.68	26.98	69.80	115.2	21.3–15.4
Cu	1.3–3.9	0.95–5.68	1.3–2.4	0.05–0.67	12.00	31.0	89.57	2.17–15.3