江苏潮区核心沉积物中的重金属的时间变化和污染状况,中国
Zhimin Hou1, Junjie Li1, Haiyan Cheng2
1Sinopec Offshore Oilfield Services Company, Shanghai 201208, PR China.
Marine pollution bulletin
|February 7, 2024
概括
这项研究分析了中国沉积物核心中的重金属,发现了自然来源,没有污染. 来自不同海洋同位素阶段的沉积物层显示出不同金属度,大多数金属在较旧,较粗的河流沉积物中最低.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 海洋地质 海洋地质学
背景情况:
- 重金属污染是一个全球性问题,需要准确的来源识别和沿海环境的风险评估.
- 沉积物核心为重建古环境条件和地球化学历史提供了宝贵的档案.
研究的目的:
- 为了确定来自中国江苏潮区的沉积物核心中的八种重金属的度和来源.
- 评估分析的沉积物序列中的潜在重金属丰富或污染.
主要方法:
- 在60.35米沉积物核心中分析了八种重金属度.
- 沉积物核心的表征使用石化层,平均颗粒大小和下核元素分布.
- 使用加速器质谱法 (AMS) 14C和光学刺激发光法 (OSL) 的时间测定.
- 包括皮尔森相关系数,丰富系数,地质积累指数和主要成分分析在内的统计分析.
主要成果:
- 沉积物被分为三个单位,对应于海洋同位素阶段 (MIS) 4,MIS 3和MIS 1.
- 除了 (Cd),其他重金属在MIS 4单元 (U3) 中平均度最低,其特点是粗的河流沉积物.
- 大多数重金属, (Al),铁 (Fe) 和总有机碳 (TOC) 之间的正相关性表明共同的自然来源.
- 统计分析表明,沉积物核心中没有显著的元素丰富或污染.
结论:
- 在江苏潮间沉积物核心中分析的重金属主要是天然的.
- 沉积面和时间数据 (MIS 4, 3, 1) 有助于解释重金属分布的变化.
- 该研究证实,在这个特定的沿海沉积物记录中,没有人为重金属污染.
相关概念视频
Quality of Water
In concrete preparation, the quality of water is paramount as it affects the strength and durability of the concrete. Potable water is usually preferred; however, it must not have excessive sodium or potassium to prevent compromising the concrete's integrity. Water quality is typically evaluated based on impurities such as dissolved solids, chlorides, and sulfates, and its pH value is ideally between 6 and 8. Even slightly acidic natural water may be acceptable unless it contains harmful...
Testing Water Quality
When the quality of water for concrete preparation is uncertain, its impact on the setting time of cement and compressive strength of mortar is assessed by comparison with de-ionized or distilled water benchmarks. American Society for Testing and Materials (ASTM) C1602 requires the setting times to be within 90 minutes of the control, British Standard (BS) 3146:1980 allows a 30-minute variance in the initial setting, while British Standards European Norm (BS EN) 1008 specifies initial setting...
Freshwater Microbial Ecology
Freshwater systems such as streams, rivers, and lakes exhibit distinct physical and biological characteristics that influence their microbial communities. These environments are broadly categorized into lotic systems—those with flowing waters like streams and most rivers—and lentic systems, which include still or slow-moving waters such as lakes, ponds, and marshes.In lentic systems, phytoplankton drive primary production, generating autochthonous organic carbon. In contrast, lotic systems...
Microbial Bioremediation of Uranium
Microorganisms play a critical role in the transformation and immobilization of uranium in contaminated environments through four main pathways: bioreduction, biosorption, bioaccumulation, and biomineralization. These mechanisms reduce uranium’s toxicity and prevent its migration through groundwater systems, offering sustainable approaches for in situ bioremediation.Bioreduction of UraniumBioreduction is driven by anaerobic bacteria such as certain strains of Geobacter and Shewanella, which use...


