Abstract：
This study investigated microplastic (MP) contamination in conventional sea salt farming systems. Various crude sea salt samples (n = 22) that were traditionally produced were collected from salt farms and local vendors. Salt water (n = 15), macroalgae (n = 6), and clay of pond floors (n = 6) were collected from ponds subjected to different production (stabilization, evaporation, and concentration and crystallization concentration) processes. All samples were analyzed for MP abundance and characteristics. The potential sources of MP contamination in the salt were also investigated. The mean abundance of MPs in the salt water and clay of pond floor increased progressively throughout the production process and reached its highest level in the concentration and crystallization ponds (7400 MP particles/m3 in salt water and 19,336 MP particles/m2 in the clay of the pond floor). A maximum of 26,500 MP particles/kg of macroalgal material indicated the potential sink of MPs on the surface of the algae. Approximately 34-2377 MP particles/kg salt were found in the crude sea salt samples. However, the mean abundance (378 MP particles/kg of salt) indicated nonsignificant impacts of different harvesting processes on MP contamination. Most MP size distributions, shapes and polymer types in the salts were similar to those found in the salt water, macroalgae and clay of the pond floor. Approximately 99% of the MPs were fragments that were suspected to be decomposed from larger plastic debris and plastic machinery and tools used at the salt farm. Similar patterns of polymer distribution, in which PP > PE > PET > PS, were found for all samples studied.
摘要：
这项研究调查了常规海盐养殖系统中的微塑料（MP）污染。传统上生产的各种粗海盐样品（n=22）是从盐场和当地供应商收集的。盐水（n=15），大型藻类（n=6），和池塘地板的粘土(n=6)是从经历不同产量的池塘中收集的(稳定，蒸发,和浓缩和结晶浓缩)过程。分析所有样品的MP丰度和特征。还研究了盐中MP污染的潜在来源。在整个生产过程中，池底盐水和粘土中MP的平均丰度逐渐增加，并在浓缩池和结晶池中达到最高水平（盐水中7400MP颗粒/m3，池底粘土中19,336MP颗粒/m2）。最大26,500MP颗粒/kg大型藻类材料表明MP在藻类表面上的潜在汇。在粗海盐样品中发现约34-2377MP颗粒/kg盐。然而,平均丰度（378MP颗粒/kg盐）表明不同收获过程对MP污染的影响不显著。大多数MP大小分布，盐中的形状和聚合物类型与盐水中的相似，池塘底的大型藻类和粘土。大约99%的国会议员是被怀疑是从盐场使用的较大塑料碎片和塑料机械和工具分解而来的碎片。类似的聚合物分布模式，其中PP>PE>PET>PS,在所有研究的样本中都找到了。
