Lake Balaton sediment database

The Lake Balaton sediment database contains the laboratory test results of a detailed survey (a total of 5560 samples) on the physico-chemical properties of the lake bed sediments carried out in the 1970s and 80s. Mixed sediment samples were taken from the upper 10 cm layer with an Ekman-Birge sediment sampler. The purpose of the survey was a detailed investigation of the lake bed sediment for the better understanding the progressive eutrophication process. The published dataset includes the following parameters (remark:missing values are replaced with '-2' in the database): - pH (KCl): measured with potenciometer - CaCO3 (%): measured with Scheibler's calcimeter - organic carbon (%): measured with Tyurin method - total nitrogen (mg kg-1): measured with Kjeldahl method - soluble phosphorus (P2O5 in mg kg-1): measured in ammonium-lactate (AL) extract with atomic adsorption spectrophotometry - potassium (K2O in mg kg-1): measured in ammonium lactate (AL) extract with flame photometer - magnesium (mg kg-1): measured in KCl extract with atomic adsorption spectrophotometry - zinc (mg kg-1): measured in EDTA + KCl extract with atomic adsorption spectrophotometry - copper (mg kg-1): measured in EDTA + KCl extract with atomic adsorption spectrophotometry - manganese (mg kg-1): measured in EDTA + KCl extract with atomic adsorption spectrophotometry

巴拉顿湖沉积物数据库（Lake Balaton sediment database）收录了20世纪70至80年代开展的湖床沉积物理化性质详细调查的实验室检测结果，共计5560份样本。研究采用埃克曼-伯奇沉积物采样器（Ekman-Birge sediment sampler）采集湖床表层0至10厘米深度的混合沉积物样本。本次调查旨在对湖床沉积物开展详尽研究，以深入解析湖泊富营养化的演进过程。该公开数据集包含以下测定参数（备注：数据库中缺失值以'-2'替代）：
- pH（KCl浸提液）：采用电位计（potenciometer）测定
- 碳酸钙（CaCO3，%）：采用谢布勒钙量计（Scheibler's calcimeter）测定
- 有机碳（%）：采用Tyurin法（Tyurin method）测定
- 总氮（mg·kg⁻¹）：采用凯氏定氮法（Kjeldahl method）测定
- 可溶性磷（以P₂O₅计，mg·kg⁻¹）：采用原子吸收分光光度法（atomic adsorption spectrophotometry）对乳酸铵（ammonium-lactate, AL）浸提液进行检测
- 钾（以K₂O计，mg·kg⁻¹）：采用火焰光度计对乳酸铵（AL）浸提液进行检测
- 镁（mg·kg⁻¹）：采用原子吸收分光光度法对KCl浸提液进行检测
- 锌（mg·kg⁻¹）：采用原子吸收分光光度法对EDTA+KCl混合浸提液进行检测
- 铜（mg·kg⁻¹）：采用原子吸收分光光度法对EDTA+KCl混合浸提液进行检测
- 锰（mg·kg⁻¹）：采用原子吸收分光光度法对EDTA+KCl混合浸提液进行检测