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随着养殖规模的扩大,鲍的育苗、养成和工厂化蓄养发生严重的异常现象,造成大面积减产。1995年1月,受长岛县政府和有关部门委托,我们承担皱纹盘鲍病因和病害防治研究项目。本文着重讨论养鲍用水的水质状况及水质处理技术。1材料与方法1.1样品的采集采样地点和时间。1995年7月13日取长岛鲍鱼育苗厂附近海水、育苗用沙滤水和排放的育苗废水;1995年7月16日取青岛第一海水浴场码头涨潮水。1.2样品的处理和分析步骤取自长岛的水样,沉淀后取上清液,使用原子吸收分光光度法分析。因需分析元素总量,所以未经过滤。… 相似文献
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1 INTRODUCTION Carrier type gamma irradiation, a new tech- nology have been developed rapidly in recent dec- ades in industry, agriculture, and science and tech- nology. In Qingdao Irradiation Center (QIC), a car- rier-type irradiator in overlapping sourc… 相似文献
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Analysis of ^232Th, ^230Th , and ^228Th in sediments showed that there was an excess of ^228Th over that supported by the parents ^282Th or ^228Ra in sediments in many regions. This excess ^228Th with a half-life of 1.91 years can be used for dating purpose over a time period of the order of a decade, so average sedimentary rates in the Yalujiang River Estuary, and in the Huanghe River Estuazy and its adjacent Laizhou Bay can be obtained from decreases in the excess ^228Th activity as a function of depth in sediment. 相似文献
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几种海藻富集N,P净化水质的研究 总被引:6,自引:0,他引:6
选用几种在富营养化养殖废水中生长的大型海藻优势种:日本多管藻(Polysiphonia japonica)、孔石莼(Ulva pertusa)、簇生刚毛藻(Cladophora fasciculatus)和褶曲刚毛藻(Cladophora flexusa),植于富营养化的地下海水中,研究其对水体中N,P等营养物质的净化效果。实验结果表明,褶曲刚毛藻对水体中的N,P有很强的吸收和转化能力,从而可快速净化富营养水体中的N,P。地下海水植入褶曲刚毛藻9h后,NO2^--N,NH4^ -N,NO3^-N和PO4^3--P的质量浓度分别降为0.0045,0.0545,0.0048,0.0116mg/L,降除率达到93%,90%,92%,75%。 相似文献
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Heavy metals pollution in Jiaozhou Bay was studied in Ruditapes. philippinarum, a bioindicator of seawater pollution. Heavy metals in soda industry wastes “white mud” were also studied. Comparison of microwave digestion method with general digestion method revealed that microwave digestion is superior to general digestion in precision, recovery, digestion speed and efficiency, etc. Cd concentration in Hongdao R.philippinarum samples exceeded the national standard by 0.046 mg/kg, that of Yinghai sample by 0.02 mg/kg,and that of Hongshiya sample by 0.22 mg/kg. Sample Pb concentration in Hongshiya was found to exceed the national standard by 0.02 mg/kg. However the heavy metals concentration in R. philippinarum near the Qingdao Alkaline Factory was complied with the standard. This was proved by Penaeus chinensis culture experiment.Therefore, the possible contamination source may come from other land areas. 相似文献
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A.水环境和水生生物的剂量率根据在本刊上一期介绍的计算模式计算了水生环境及水生生物的剂量率。表15—29是IAEA专家小组对水环境和水生物所计算的剂量率。可以利用海水中的~(238)U,通过几何模型来计算浮游植物、浮游动物、甲壳动物、软体 相似文献