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1.
选择较有代表性的宁波市郊慈镇作为典型,调查分析了铜业乡镇企业对周围农业环境的污染情况。调查结果表明,污染源附近水域水质铜含量为0.009~8.461mg/L,超标率为43.8%,锌为0.02~5.92mg/L,超标率为37.5%。土壤中铜的含量为33.1~326.2mg/kg,超标率为72.2%。粮食中铜含量为2.19~24.20mg/kg,超标率为37.5%。  相似文献   

2.
化学需氧量光度测定法探索   总被引:5,自引:0,他引:5  
试验证明,COD光度测定法是可行的,本法测定范围为0~200mg/L,测定波长为434nm,K2Cr2O7标准溶液最佳使用浓度为0.0675mol/L(1/6K2Cr2O7)在此浓度下COD为200mg/L,的葡萄糖溶液实际测得值只比标准滴定法低1.8%。  相似文献   

3.
以气相色谱石英毛细管柱分离、FID检测,测定废水和废气中N′,N-二甲基甲酰胺(DMF)。在10mg/L~18810mg/L范围内有良好的线性关系。检测限:废水为05mg/L;废气为08mg/m3。样品测定的相对标准差为4%~8%,回收率在76%~112%之间,精密度和准确度均较好  相似文献   

4.
气相色谱法测定废水和废气中N‘,N—二甲基甲酰胺   总被引:3,自引:0,他引:3  
以气相色谱石英毛细管柱分离,FID检测,测定废水和废气中N’,N-二甲基甲酰胺(DMF),在1.0mg/L ̄1881.0mg/L范围内有良好的线性关系,检测限:废水为0.5mg/L;废气为0.8mg/m^3,样品测定的相对标准差为4% ̄8%,回收率在76% ̄112%之间,精密度和准确度均较好。  相似文献   

5.
环境中N,N──二甲基甲酰胺的气相色谱分析   总被引:1,自引:0,他引:1  
本法采用直接注入水溶液样品,方法适应性强,水、气均可分析,浓度在1~100mg/L范围内的线性良好,相关系数0.999以上。灵敏度高,相对标准偏差小于4%,最低检测浓度为l.omg/L,回收率均在95%~105%之间。  相似文献   

6.
气相色谱法测定环境空气中氯化苄和甲苯   总被引:1,自引:0,他引:1  
用串联的乙醇吸收管收集环境空气中的氯化苄和甲苯,以毛细管柱分离,氢火焰检测器测定,保留时间定性,峰高定量。氯化苄平均浓度在4.29mg/L~21.4mg/L时,相对标准偏差在3.3%~4.6%之间;甲苯平均浓度为4.18mg/L~20.6mg/L时,相对标准差在4.4%~7.8%范围内。方法快速、灵敏度高,有较好的精密度与准确度。  相似文献   

7.
以CPB20毛细管柱氢火焰检测器检测己内酰胺,水样可不经较多地处理即可测定。方法线性范围0mg/L-50mg/L,检测限0.5mg/L,加标回收在79%-125%之间。  相似文献   

8.
光离子化检测器便携式气相色谱仪快速测定空气中苯系物   总被引:3,自引:0,他引:3  
本文研究了使用光离子化检测器便携式气相色谱仪,直接测定空气中mg/m3级苯系物(苯、甲苯、乙苯、邻、间、对位的二甲苯及异丙苯)的快速分析方法。方法的线性范围为0~100mg/m3,相关系数均在0.999以上,方法的变异系数分别为2.9~12.5%(5mg/m3),3.4~7.9%(30mg/m3),方法最低检测限达0.2~1.0mg/m3。  相似文献   

9.
石墨炉原子吸收法测定废水中锑   总被引:3,自引:0,他引:3  
以钯作基改进剂建立了测定废水中锑的石墨炉原子吸收光谱分析法。方法线性范围为0mg/L-10mg/L,检测限为0.02mg/L。相对标准差为3%,回收率为96.7%-101.3%,结果令人满意。  相似文献   

10.
石墨炉原子吸收分光光度法测定水中铝   总被引:4,自引:0,他引:4  
采用加入基体改进剂,建立了用石墨炉原子吸收光度法测定铝的新方法,方法线性范围为0μg/L-20μg/L,检出限0.042μg/L,相对标准差1.3%,回收率为98.3%-102.6%。用于监测黑龙江江水中铝,获得了满意结果。  相似文献   

11.
The stable nitrogen isotope ratios of some biota have been used as indicators of sources of anthropogenic nitrogen. In this study the relationships of the stable nitrogen isotope ratios of marsh plants, Iva frutescens (L.), Phragmites australis (Cav.) Trin ex Steud, Spartina patens (Ait.) Muhl, Spartina alterniflora Loisel, Ulva lactuca (L.), and Enteromorpha intestinalis (L.) with wastewater nitrogen and land development in New England are described. Five of the six plant species (all but U. lactuca) showed significant relationships of increasing δ 15N values with increasing wastewater nitrogen. There was a significant (P < 0.0001) downward shift in the δ 15N of S. patens (6.0 ± 0.48‰) which is mycorrhizal compared with S. alterniflora (8.5 ± 0.41‰). The downward shift in δ 15N may be caused by the assimilation of fixed nitrogen in the roots of S. patens. P. australis within sites had wide ranges of δ 15N values, evidently influenced by the type of shoreline development or buffer at the upland border. In residential areas, the presence of a vegetated buffer (n = 24 locations) significantly (P < 0.001) reduced the δ 15N (mean = 7.4 ± 0.43‰) of the P. australis compared to stands where there was no buffer (mean = 10.9 ± 1.0‰; n = 15). Among the plant species, I. frutescens located near the upland border showed the most significant (R 2 = 0.64; P = 0.006) inverse relationship with the percent agricultural land in the watershed. The δ 15N of P. australis and I. frustescens is apparently an indicator of local inputs near the upland border, while the δ 15N of Spartina relates with the integrated, watershed-sea nitrogen inputs.  相似文献   

12.
Facile, selective and sensitive spectrophotometric method has been developed for the determination of bendiocarb in its insecticidal formulations, fortified water, food grains, agriculture wastewater and agriculture soil samples with prepared reagents. The method was based on alkaline hydrolysis of the bendiocarb pesticide, and the resultant hydrolysis product of bendiocarb was coupled with 2,6-dibromo-4-methylaniline to give a yellow color product with λmaxof457 nmorcouplingwith2, 6−dibromo−4−nitroanilinetoproducearedcoloredproductwithλmax of474~nmorcouplingwith2, 4, 6−tribromoanilinetoformorangeredcoloredproducthasaλmax of465 nm.Underoptimalconditions, Beer'slawrangefor2, 6−dibromo−4−methylaniline(DBMA)wasfoundtobe0.6−−14.0~μgmL -1, 0.8−−10.0 μgmL -1 for2, 6−dibromo−4−nitroaniline(DBNA)and0.4−−10.0 μgmL -1 for2, 4, 6−tribromoaniline(TBA).Themolarabsorptivityofthecolorsystemswerefoundtobe4.126~×~104 lmol -1cm -1 forDBMA, 3.254×104 l~mol -1cm -1 forDBNAand2.812×104 lmol -1cm -1 forTBA.Sandell'softhecolorreactionsare0.018 μgcm -2(DBMA), 0.052 μgcm -2(DBNA)and0.065 μgcm -2$ (TBA) respectively. The effect of the non-target species on the determination of bendiocarb was studied. The formation of colored derivatives with the coupling agents is instantaneous and stable for 18 h, 30 h, and 12 h. Performance of the proposed methods were compared statistically in terms Student's F and t-tests with the reported methods.  相似文献   

13.
Physico-chemical characteristics of some river and hand-dug well waters used for drinking and domestic purposes in the oil rich Niger Delta area of Nigeria were assessed using standard methods. The concentrations of the parameters in the river water samples ranged in the following order: pH (5.6–6.9), temperature (26.90–28.60°C), turbidity (23–63 NTU), electrical conductivity (52–184 μs/cm), DO (5.4–7.2 mg/l), BOD (21–57 mg/l), TDS (6.0–217 mg/l), PO4 3− (0.19–1.72 mg/l), SO4 2− (25–36.8 mg/l), NO3 (20.3–28 mg/l), Fe (6.07–15.71 mg/l), Zn (0.04–0.24 mg/l), Pb (0.01–0.17 mg/l), Ni (0.01–0.13 mg/l), Vn (0.01–0.20 mg/l) and Hg (0.001–0.002 mg/l). The concentrations of these parameters in the hand-dug well water ranged in the following order: pH (5.7–6.8) temperature (26–30°C), turbidity (134–171 NTU), electrical conductivity (160–340 μs/cm), DO (5.4–6.4 mg/l), BOD (13–34 mg/l), TDS (110–190 mg/l), PO4 3− (0.84–1.84 mg/l), SO4 2− (10.6–28.1 mg/l), NO3 (11.3–23 mg/l), Fe (13.17–16.31 mg/l), Ni (0.01–0.02 mg/l), Vn (0.01–0.04 mg/l) and Hg (0.001–0.004 mg/l). The concentrations of BOD, turbidity, NO3 and Fe in the water samples were above WHO and FMENV permissible limits for safe drinking water. The results suggest that the use of such waters for drinking and domestic purposes pose a serious threat to the health of the users and calls for the intervention of government agencies.  相似文献   

14.
This study monitored atmospheric pollutants during high wind speed (> 7 m s−1) at two sampling sites: Taichung Harbor (TH) and Wuci traffic (WT) during March 2004 to January 2005 in central Taiwan. The correlation coefficient (R 2) between TSP, PM2.5, PM2.5−10 particle concentration vs. wind speed at the TH and WT sampling site during high wind speed (< 7 m s−1) were also displayed in this study. In addition, the correlation coefficients between TSP, PM2.5 and PM2.5−10 of ionic species vs. high wind speed were also observed. The results indicated that the correlation coefficient order was TSP > PM2.5−10 > PM2.5 for particle at both sampling sites near Taiwan strait. In addition, the concentration of Cl, NO3 , SO4 2−, NH4 +, Mg2+, Ca2+ and Na+ were also analyzed in this study.  相似文献   

15.
In this work, water and sediment samples were collected from three different stations located along the Sakarya river between May and September 2003. Lead, copper, chromium, zinc, nickel and cadmium concentrations were determined by using solvent extraction and flame atomic absorption spectrometric method. The results show that differences based upon sampling times, regions, sediment and water samples were observed. The mean levels of copper, nickel, chromium, lead, cadmium, zinc for sediment samples are; 4.630 μg g−1, 13.520 μg g−1, 8.780 μg g−1, 2.550 μg g−1, 9.990 μg g−1 and for water samples are; 0.851 μg g−1, 1.050 μg g−1, 0.027 μg g−1, 1.786 μg g−1, 0.236 μg g−1, 0.173 μg g−1, respectively.  相似文献   

16.
Atmospheric surface aerosol radiative forcing (SARF) ΔF, forcing efficiency ΔFe and fractional forcing efficiency ΔFFe evaluated from cloud-screened narrowband spectral and thermal-offset-corrected radiometric observations during the Asia dust outbreak episodes in Gwangju, Republic of Korea are reported in this study. Columnar aerosol optical properties (aerosol optical depth (AOD), τ , Angstrom exponent α, mass concentration of fine and coarse mode particles) were also reported for the station between January 2000 and May 2001 consisting of 211cloud-free days. Results indicate that majority of the AOD were within the range 0.25–0.45 while some high aerosol events in which AODs ≥ 0.6 were observed during the severe dust episodes. For example, AOD increases from annual average value of 0.34 ± 0.13 at 501 nm to values >0.60 during the major dust events of March 27–30 and April 7–9, 2000, respectively. The α 501–870 nm which is often used as a qualitative indicator of aerosol particle size had values ranging from 0.01 to 1.77. The diurnal forcing efficiency ΔDFe at Gwangju was estimated to be −81.10 ± 5.14 W m −2/τ 501 nm and −47.09 ± 2.20 W m −2/τ 501 nm for the total solar broadband and visible band pass, respectively while the fractional diurnal forcing efficiency ΔFDFe were −15.8 ± 0.64%/τ 501 nm and −22.87 ± 1.13%/τ 501 nm for the same band passes. Analyses of the 5-day air-mass back trajectories were further developed for Gwangju in order to classify the air-mass and types of aerosol reaching the site during the Asia dust episodes.  相似文献   

17.
Facile, selective and sensitive spectrophotometric method has been developed for the determination of carbosulfan in insecticidal formulations, fortified water, food grains, agriculture wastewater and soil samples with newly synthesized reagents. The method was based on acid and alkaline hydrolysis of the carbosulfan pesticide, and the resultant hydrolysis product of carbosulfan was coupled with 2,6-dibromo-4-methylaniline to give a yellow color product with λ max of 464 nm or interaction with 2,6-dibromo-4-nitroaniline to produce yellow colored product with λ max of 408 nm or coupling with 2,4,6-tribromoaniline to form red colored product has a λ max of 471 nm. Under optimal conditions, Beer’s law range for 2,6-dibromo-4-methylaniline (DBMA) was found to be 0.2–12.0 μg ml−1, 0.6–16.0 μg ml−1 for 2,6-dibromo-4-nitroaniline (DBNA) and 0.4–15.0 μg ml−1 for 2,4,6-tribromoaniline (TBA). The molar absorptivity of the color systems were found to be 3.112 × 104 l mol−1 cm−1 for DBMA, 3.214 × 104 l mol−1 cm−1 for DBNA and 3.881 × 104 l mol−1 cm−1 for TBA. Sandell’s of the color reactions are 0.013 μg cm−2 (DBMA), 0.012 μg cm−2 (DBNA) and 0.011 μg cm−2 (TBA) respectively. The effect of the non-target species on the determination of carbosulfan was studied to enhance the selectivity of the proposed methods. The formation of colored derivatives with the coupling agents is instantaneous and stable for 28, 30, and 26 h. Performance of the proposed methods were compared statistically in terms Student’s F and t-tests with the reported methods. An erratum to this article can be found at  相似文献   

18.
The present work considers the section of the Mesta River on Bulgarian territory using the integral method for evaluation of climate and anthropogenic impact on the river flow. The level of this impact is determined by the index K i (flow module), the coefficient C i for the deviation of the average annual water volume Q i from the flow norm Q o and the index h i for the deviation of the average annual rainfall volume H i from the average multi-annual rainfall volume H o . The dynamics of the average annual flow Q i at two typical hydrometric stations – Yakoruda and Khadzhidimovo, as well as the dynamics of the average annual rainfall for the Yakoruda station was examined for the period 1955–2003. The data for the considered period 1955–2003 exhibit a decreasing trend of the average annual water volumes dynamics for both stations due to the impact of climate changes in the Mesta River catchment.  相似文献   

19.
Two strains of Pseudomonas species (B2 and D5)selected from an array of lead solubilizing and accumulatingbacteria obtained from the effluent contaminated soil samples of abattery manufacturing factory were studied. Increase in pH between 4.0 and 6.0 favoured the growth of isolates: Peaklog10 cfu mL–1 values of 7.1, 7.5 and 8.5 wereobtained at pH 4, 5 and 6, respectively.Cell bound lead concentrations for B2 (0.34 mg mL–1)and D5 (0.30 mg mL–1) obtained by direct contact withPbs were greater than lead concentrations of 0.89 and 0.25 mg mL–1 for B2 and D5, respectively,obtained in dialyzed cultures. These cell bound lead concentration in undialyzed cultures were alsogreater than lead concentrations of 0.03 and 0.07 mg mL–1 for B2 and D5 in culture supernatants. Glucose addition did nor improve lead accumulation in the isolates.Exploitation of such isolates for the biotreatment of lead ladeneffluent was conducted.  相似文献   

20.
为研究中国30个省/自治区/直辖市之间电力区域调配的污染物转移效应,构建了电力传输的污染转移模型,并以SO_2和NO_x为例对2006、2015年数据进行测算。结果表明,2015年电力行业SO_2、NO_x排放强度分别由2006年的4.03、2.18 g/(kW·h)下降到0.69、0.77 g/(kW·h)。2015年,16个电力净输入区通过电力跨区域传输的SO_2、NO_x转移量分别为47.8×10~4、53.0×10~4t,占这些地区电力行业SO_2、NO_x排放量的24.1%、24.2%;14个电力净输出区通过电力跨区域传输的SO_2、NO_x转移量分别为-54.6×10~4、-52.1×10~4t,占这些地区电力行业SO_2、NO_x排放量的26.5%、22.8%。研究结果对于分析区域物质流动所隐含的污染流动,全面认识区域污染物排放格局,制定合理的区域污染减排目标具有一定借鉴意义。  相似文献   

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