CONCENTRATION F METALS IN THE RIVERS OF THE …：在金属浓度的河流…

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1、Concentartion of metals in the rivers of south part of Primorie, Russia.V. M. Shulkin, N. N. BogdanovaPacific Geographical Institute RAS, Vladivostok 690041,RussiauImprovement of sampling and analysis technique leads to revision of the metal concentration in many rivers especially in moderately cont

2、aminated and pristine ones.uBut other consequences of these research is the increase in contrast of distribution of the metals at the significant anthropogenic influence and enhance of the opportunities to use metals as indicator of biogeochemical processes and/or anthropogenic loading uAim of prese

3、ntation is to show new data on the content of dissolved Fe, Mn, Zn, Cu, Pb, Cd and their concentration in suspended solids in Razdolnaya River - one of the main rivers of the south of Primorski Krai.u The second aim is to characterize of metal concentration in the downstream of Tumen River the bigge

4、st river of Japan/East Sea basin.Materials and MethodsuTwo sampling along Razdolnaya River were carried out at low water in June and in September 2003 from headwaters to the downstream, and additional sampling at the high water in July, 2002 and July 2004. uWater discharge of Razdolnaya River in Jun

5、e 2003 changed from 34,5 m3 /s at headwaters up to 42 m3 /s at downstream. In September 2003 the water discharge was even lower: 10 m3/s and 22,5 m3/s, accordingly. In July 2004 water discharge was 160 m3/s, and in late summer 2002 so high as 349 m3/s. uThe down stream of Tumen River had been sample

6、d several times from 1998 till 2004, including high water in July 2002. uSampling were carried out in preliminary washed polyethylene bottles with use of pump MasterFlex and capsule filter AquaPrep with the effective pore size 0,45 microns to obtain filtrate with dissolved forms of metals directly o

7、n a place of sampling. Simultaneously 5-8 litres of water were sampled for subsequent segregation and analysis of suspended solids.uThe concentration of the dissolved forms of metals determined by atomic-absorption spectrophotometry (S) on device Shimadzu-6800F/G in flame and in graphite furnace aft

8、er concentration of metals by extraction with dietilditiocarbaminat-Na in CHCl3. Concentration of metals in suspended solids was determined by the same AAS after full decomposition of filters with solids by acid mixture HF-HClO4. The most obvious feature is the peak of concentration of dissolved for

9、ms Mn, Zn and Fe in river waters near Ussuriisk city. uIn September at the lowered water discharge this maximum is expressed much more brightly, than in June though the general level of concentration of dissolved metals along Razdolnaya River in June, 2003 was higher, than in September. Sewages from

10、 Ussuriisk do not conduct to significant increase of concentration dissolved Cu, Cd, and Pb in adjoining part of Razdolnaya uSome increase in concentration of dissolved Cd and Pb is observed at all middle stream of Razdolnaya River due to non-point drainage from middle part of watershed uUnusual fea

11、ture of spatial distribution of dissolved Pb is a significantly increase in headwaters uFor the transport of metals in the rivers the significant role of the suspended forms in the general balance is typical. The rivers of the south of Primorski Krai are not exception.u Even at low water mode more t

12、han 70 % Zn, 90 % Fe and 95 % Pb are transported into suspended solids. The share of suspended forms in Cu and Cd balance makes about 50 %. uIn a high water sharp dominance of the suspended forms is observed for all metals due to increase in the contents of a suspended solids at the order and more.u

13、 From the point of view of seasonal variability, the main factor controlling contents and a role of suspended forms of metals is a quantity of a suspended solids which itself defined by a hydrological mode, first of all. uBut for the characteristic of geochemical features of a river drain and for th

14、e assessment of anthropogenic influence concentration of metals in a suspended solids (on a mass unit) is more informative than content of suspended metal forms (on a volume of water unit).Table. Concentration of metals in suspended solids of the Razdolnaya River, Tumen River RiverR a z d o l n a y

15、a , upstream, low water*4.083172125361021.31R a z d o l n a y a , down stream, low water*5.27395913443940.43R a z d o l n a y a down stream, high water*3.563026522380.08Tumen, mouth, low water15.27250321566660.66Tumen, mouth, high water*5.9398215341510.04Av e r a g e o n Rivers of the World 24,79104

16、3250100461,23Spatial variability of metal concentration in suspended solids along Razdolnaya River is more indicative uThe main feature is the peak of concentration of all metals in a suspended matter near Ussuriisk. For almost all metals this maximum is especially strongly expressed in September uF

17、urther downstream concentration of metals falls in most cases up to a level close or smaller, than in a suspension of head waters of Razdolnaya River. uOnly for Fe concentration in suspended solids of the down stream is higher, than in head waters due to more fine grained material.u The significant

18、increase of dissolved Cd and Pb noted in upstream of Razdolnaya River was confirmed by elevated concentration of these metals in suspended matter of this part of river (Fig.3). A level achievable here (150 g / g Pb and 2 g /g Cd) at 5-10 time exceeds a regional background for unpolluted river suspen

19、sion uConcentrations of dissolved Mn, Zn, and Cu in headwaters of Razdolnaya River are 20-30; 0,3-0,7; 1,2-1,3 g /l, accordingly, that is close to the level of unpolluted rivers. However, the concentration of dissolved Pb and Cd is 3-10 time higher than background, due to additional input from Chine

20、se Peoples Republic, or due to unknown sources at the Russian territory. Concentration Fe, Zn, Cu in suspended solids of headwaters is equal to background, but on Pb and Cd in suspended solids is observed 2-10 time increase upon background level as well as for the dissolved forms.uChange of concentr

21、ation of metals in solution and in suspended matter along Razdolnaya River allows to characterize confidently a degree and character of anthropogenic influence, and to assess existing self-cleaning ability of the river. uAnthropogenic influence on the concentration of metals in Razdolnaya River coul

22、d be registered on distance of 10-20 km downwards from Ussuriisk. At the greater water discharge anthropogenic increase of concentration of the dissolved metals is traced further downstream. However on distance of 40 km downstream off Ussuriisk concentration of the majority of the dissolved metals i

23、n June and September are compared and reduced up to a background level (0,09-0,9 g/l Zn, 0,005-0,008 g /l Pb, 0,004 g /l Cd, 2-12 g /l Mn). uDespite of obvious and significant anthropogenic influence on the metal concentration in solution and suspended solids of Razdolnaya River, self-cleaning abili

24、ty of the river is sufficient and in the downstream concentration of the dissolved metals is reduced close to background. The basic mechanism of self-cleaning is, probably, sorption on suspended matter.uConcentration of metals in downstream of Tumen River do not show heavy anthropogenic press, but dissolved Cu and Zn, and Cu in suspended matter as well, are elevated compare with down stream of Razdolnaya River and unpolluted streams.