This paper is concerned with the distibuticn of seme geochemical factors in sediments from Huanghe River Estuary，such as Eh,pH,Fe/Fe and the ratio of elementsp which show the characteristics of sedimentation in the e...This paper is concerned with the distibuticn of seme geochemical factors in sediments from Huanghe River Estuary，such as Eh,pH,Fe/Fe and the ratio of elementsp which show the characteristics of sedimentation in the estuary.According to the physical-chemistry principle the diagram of FeS2-Fe3O4-Fe2O3 system is made to indicate the coexistence and the tranform among minerals.展开更多
Model DF-1 electrochemical analyzer is a many-purpose electrochemical instrumentation with following five functional select switches for operating conditions: cathodic /anodie polarization; single/cycle sean；two/thre...Model DF-1 electrochemical analyzer is a many-purpose electrochemical instrumentation with following five functional select switches for operating conditions: cathodic /anodie polarization; single/cycle sean；two/three electrodes system；direct/derivative output；normal/differential mode. Consequently they can be combined into several working manners, result in different experimental methods as consistent with desire. This instrument has manifold compensator and adjuster with a wide-range, so that the sensitivity and the signal graph have been able to improve. In addition, the instrument incorporates a strip-chart recorder and an exact timer. It is also equipped with electrochemical bench and a set of electrodes including the rotating glassy carbon electrode, gold plate electrode, silver plate electrode, mercury coated silver base electrode, hanging mercury electrode etc. In order to broaden the field of its application, all units of the instrument can be unitized, but each and every can be also used independently. The instrument is applicable to polarography, voltammetry, potentiometric stripping, potentiostatic electrolysis,differential technique, coulometry, linear polarization method, cycle voltammetry, passivation curve, and some other electrochemical technique, which have need for electrochemical cell with two, three，or four electrodes. This paper describes the design fundament, feature and specification of the electrochemical analyzer, and finally gives laboratory application some experimental examples.展开更多
Ten samples from the Huanghe River Estuary were analysed to separate the heavy metals (Cu, Pb, Zn, Cr, Ni, Fe, Mn, Cd) into following phases: (1) adsorbed to materials, (2) bound to carbonates, (3) Fe-Mn oxides, (4) o...Ten samples from the Huanghe River Estuary were analysed to separate the heavy metals (Cu, Pb, Zn, Cr, Ni, Fe, Mn, Cd) into following phases: (1) adsorbed to materials, (2) bound to carbonates, (3) Fe-Mn oxides, (4) organic matters, (5) residual. The contents of the heavy metals in residue fraction account to the main part of the total concentrations. The concentrations of the heavy metals adsorbed on the materials are very low, and the heavy metals bound to Fe-Mn oxides are relatively stable, making up 10-20 percent of the t otal concentrations, which indicates that there is almost no heavy metal pollution in the estuary. The content of Pb, Mn bound to carbonates are rather high, Pb makes up 18-42 percent, Mn 22-63 percent of the total concentration, which are caused by geological process and coincide with the high content of carbonates in the loess. Cu is concentrated in organic matter indicating the strong complexation abilily of copper with organic matter. The distribution of all the eight elements are not all the same. The order of their progressive decreasing are written as follows: (1) Cu, Cr, Hi, Fe, Zn: Ⅴ>Ⅳ≥Ⅲ>Ⅱ>Ⅰ; (2) Pb, Cd: Ⅴ>Ⅱ>Ⅲ≥Ⅳ Ⅰ;(3) Mn:Ⅱ>Ⅴ>Ⅲ>Ⅳ>Ⅰ.展开更多
There are few papers dealing with nutrients distribution in the mixing region of the Huanghe River Estuary, although the Huanghe River is one of the largest rivers in China. We investigated nutrients (nitrate nitrite,...There are few papers dealing with nutrients distribution in the mixing region of the Huanghe River Estuary, although the Huanghe River is one of the largest rivers in China. We investigated nutrients (nitrate nitrite, phosphate and silicate) at 81 stations in the southwest Bohai Sea and the Huanghe River Estuary in July, 1984. The concentrations of nitrate, nitrite, phosphate and silicate are higher in the estuary and offshore than those in the centre of the Bohai Sea. They are 44.3ug-at/L for nitrate, 0.31ug-at/L for nitrite, 0.36ug-at/L for phosphate and 60.4ug-at/L for silicate. There are negative correlations between nutrients and salinity in this region. The correlation coefficients in surface layer are:γSiO3-si=-0.963(n=81) γPO4-P=-0.829(n=81) γNO3-N=-0.971(n=81) γNO2-N=-0.553(n=81) The correlation coefficients show that, in the surface layer, there are no obvious removal of nutrients during mixing river-water and seawater in the Huanghe River Estuary.展开更多
This paper is based uPon the principles of volumetric method for determination of potassium with sodium tetraphenylboron and quaternary ammonium salt. A linear equation was found between volume (V) of quaternary ammon...This paper is based uPon the principles of volumetric method for determination of potassium with sodium tetraphenylboron and quaternary ammonium salt. A linear equation was found between volume (V) of quaternary ammonium salt and quantity (K) of potassium in sample. On the basis of this equation,the use of working curves has been suggested. The results of the experiments indicated that the linear relation between V and K is very good when the quantity of potassium in sample is more than 0.Smg. This method is also suitable for determination of potassium in various salt solution. With the increase of concentration of the salt solution, Which has the same amount of potassium, The volume of quaternary ammonium salt solution decreases regularly. The influence of co-existance and interference ions can be eliminated by using this working curve method.As compared with the original method,this method is not only accurate and precise but also rapid, simple and convenient. It has been tested by the determination of potassium in a sea water sample and the standard deviation is found to be≤±0.001mg/ml.展开更多
The results of the suspended material measurement in the Huanghe River Estuary show that the silt movement in the estuary is different during summer and winter. The centric water-mass in Bohai Sea enters the Laizhou B...The results of the suspended material measurement in the Huanghe River Estuary show that the silt movement in the estuary is different during summer and winter. The centric water-mass in Bohai Sea enters the Laizhou Bay, which makes the fresh water occupy the head of Laizhou Bay and prevents the silt from spveading to the sea.The disturbing of wind in winter makes the sediment resuspend which results in the high content of suspended materials in the water. The distribution of suspended materials and salinity in summer indicate that because of its own momentum, the silt from the Huanghe River will go ahead out of the river mouth and the effect of centric water-mass in the middle Bohai Sea is relatively small in summer. The distributions of suspended materials in the mid and bottom layer water during different seasons show that the primary direction of the siltl movement in the estuary is towards NE, whice coincides with the movement of residual current.Our paper also presents the size distribution of suspended materials.According to the data, we consider that the silt from Huanghe River moves mainly in the surface layer and the Huanghe River Estuary belongs to weak mixing estuary.展开更多
Domestic polymeric microbeads GDX-502 were used to concentrate benzene hydrocarbon from seawater. The absorbed benzene hydrocarbon was removed by thermal desorption and directly injected into gas chromatograph and det...Domestic polymeric microbeads GDX-502 were used to concentrate benzene hydrocarbon from seawater. The absorbed benzene hydrocarbon was removed by thermal desorption and directly injected into gas chromatograph and determined by FID detector. It was optimal for the rapid and precise determination of trace benzene hydrocarbon in seawater. In this Paper the investigation of benzene hydrocarbon in the coastal water of Jiaozhou Bay (Qingdao) is reported as well. The data for benzene hydrocarbon are listed in table 3 for 1984 and the station locations are given in figure 6.展开更多
This paper deals With the adsorption conditions of type FH1 humic acid resin on Cr^3+ and Zn^2+ With the different concentrations of Cr^3+ and Zn^2+, the optimum adsorption conditions of the resin including pH,tempera...This paper deals With the adsorption conditions of type FH1 humic acid resin on Cr^3+ and Zn^2+ With the different concentrations of Cr^3+ and Zn^2+, the optimum adsorption conditions of the resin including pH,temperature and amount of resin vary to some extent. When the concentration of Cr^3+≤100mg, adsorptivity of the resin is>98%, the amount of its saturation adsorption is about 50.2mg/g；when the concentration of Zn^2+ is≤100mg/l, the adsorptivity of the resin is>98% and the amount of its saturation adsorption is about 87.1mg/g.展开更多
文摘This paper is concerned with the distibuticn of seme geochemical factors in sediments from Huanghe River Estuary，such as Eh,pH,Fe/Fe and the ratio of elementsp which show the characteristics of sedimentation in the estuary.According to the physical-chemistry principle the diagram of FeS2-Fe3O4-Fe2O3 system is made to indicate the coexistence and the tranform among minerals.
文摘Model DF-1 electrochemical analyzer is a many-purpose electrochemical instrumentation with following five functional select switches for operating conditions: cathodic /anodie polarization; single/cycle sean；two/three electrodes system；direct/derivative output；normal/differential mode. Consequently they can be combined into several working manners, result in different experimental methods as consistent with desire. This instrument has manifold compensator and adjuster with a wide-range, so that the sensitivity and the signal graph have been able to improve. In addition, the instrument incorporates a strip-chart recorder and an exact timer. It is also equipped with electrochemical bench and a set of electrodes including the rotating glassy carbon electrode, gold plate electrode, silver plate electrode, mercury coated silver base electrode, hanging mercury electrode etc. In order to broaden the field of its application, all units of the instrument can be unitized, but each and every can be also used independently. The instrument is applicable to polarography, voltammetry, potentiometric stripping, potentiostatic electrolysis,differential technique, coulometry, linear polarization method, cycle voltammetry, passivation curve, and some other electrochemical technique, which have need for electrochemical cell with two, three，or four electrodes. This paper describes the design fundament, feature and specification of the electrochemical analyzer, and finally gives laboratory application some experimental examples.
文摘Ten samples from the Huanghe River Estuary were analysed to separate the heavy metals (Cu, Pb, Zn, Cr, Ni, Fe, Mn, Cd) into following phases: (1) adsorbed to materials, (2) bound to carbonates, (3) Fe-Mn oxides, (4) organic matters, (5) residual. The contents of the heavy metals in residue fraction account to the main part of the total concentrations. The concentrations of the heavy metals adsorbed on the materials are very low, and the heavy metals bound to Fe-Mn oxides are relatively stable, making up 10-20 percent of the t otal concentrations, which indicates that there is almost no heavy metal pollution in the estuary. The content of Pb, Mn bound to carbonates are rather high, Pb makes up 18-42 percent, Mn 22-63 percent of the total concentration, which are caused by geological process and coincide with the high content of carbonates in the loess. Cu is concentrated in organic matter indicating the strong complexation abilily of copper with organic matter. The distribution of all the eight elements are not all the same. The order of their progressive decreasing are written as follows: (1) Cu, Cr, Hi, Fe, Zn: Ⅴ>Ⅳ≥Ⅲ>Ⅱ>Ⅰ; (2) Pb, Cd: Ⅴ>Ⅱ>Ⅲ≥Ⅳ Ⅰ;(3) Mn:Ⅱ>Ⅴ>Ⅲ>Ⅳ>Ⅰ.
文摘There are few papers dealing with nutrients distribution in the mixing region of the Huanghe River Estuary, although the Huanghe River is one of the largest rivers in China. We investigated nutrients (nitrate nitrite, phosphate and silicate) at 81 stations in the southwest Bohai Sea and the Huanghe River Estuary in July, 1984. The concentrations of nitrate, nitrite, phosphate and silicate are higher in the estuary and offshore than those in the centre of the Bohai Sea. They are 44.3ug-at/L for nitrate, 0.31ug-at/L for nitrite, 0.36ug-at/L for phosphate and 60.4ug-at/L for silicate. There are negative correlations between nutrients and salinity in this region. The correlation coefficients in surface layer are:γSiO3-si=-0.963(n=81) γPO4-P=-0.829(n=81) γNO3-N=-0.971(n=81) γNO2-N=-0.553(n=81) The correlation coefficients show that, in the surface layer, there are no obvious removal of nutrients during mixing river-water and seawater in the Huanghe River Estuary.
文摘This paper is based uPon the principles of volumetric method for determination of potassium with sodium tetraphenylboron and quaternary ammonium salt. A linear equation was found between volume (V) of quaternary ammonium salt and quantity (K) of potassium in sample. On the basis of this equation,the use of working curves has been suggested. The results of the experiments indicated that the linear relation between V and K is very good when the quantity of potassium in sample is more than 0.Smg. This method is also suitable for determination of potassium in various salt solution. With the increase of concentration of the salt solution, Which has the same amount of potassium, The volume of quaternary ammonium salt solution decreases regularly. The influence of co-existance and interference ions can be eliminated by using this working curve method.As compared with the original method,this method is not only accurate and precise but also rapid, simple and convenient. It has been tested by the determination of potassium in a sea water sample and the standard deviation is found to be≤±0.001mg/ml.
文摘The results of the suspended material measurement in the Huanghe River Estuary show that the silt movement in the estuary is different during summer and winter. The centric water-mass in Bohai Sea enters the Laizhou Bay, which makes the fresh water occupy the head of Laizhou Bay and prevents the silt from spveading to the sea.The disturbing of wind in winter makes the sediment resuspend which results in the high content of suspended materials in the water. The distribution of suspended materials and salinity in summer indicate that because of its own momentum, the silt from the Huanghe River will go ahead out of the river mouth and the effect of centric water-mass in the middle Bohai Sea is relatively small in summer. The distributions of suspended materials in the mid and bottom layer water during different seasons show that the primary direction of the siltl movement in the estuary is towards NE, whice coincides with the movement of residual current.Our paper also presents the size distribution of suspended materials.According to the data, we consider that the silt from Huanghe River moves mainly in the surface layer and the Huanghe River Estuary belongs to weak mixing estuary.
文摘Domestic polymeric microbeads GDX-502 were used to concentrate benzene hydrocarbon from seawater. The absorbed benzene hydrocarbon was removed by thermal desorption and directly injected into gas chromatograph and determined by FID detector. It was optimal for the rapid and precise determination of trace benzene hydrocarbon in seawater. In this Paper the investigation of benzene hydrocarbon in the coastal water of Jiaozhou Bay (Qingdao) is reported as well. The data for benzene hydrocarbon are listed in table 3 for 1984 and the station locations are given in figure 6.
文摘This paper deals With the adsorption conditions of type FH1 humic acid resin on Cr^3+ and Zn^2+ With the different concentrations of Cr^3+ and Zn^2+, the optimum adsorption conditions of the resin including pH,temperature and amount of resin vary to some extent. When the concentration of Cr^3+≤100mg, adsorptivity of the resin is>98%, the amount of its saturation adsorption is about 50.2mg/g；when the concentration of Zn^2+ is≤100mg/l, the adsorptivity of the resin is>98% and the amount of its saturation adsorption is about 87.1mg/g.
