CCZO -- Stream Water Chemistry -- Calhoun CZO -- (2014-2018)

This is water chemistry data for stream samples collected monthly from July 2014-December 2018 within the Tyger River and Enoree River watersheds, including Holcombe’s Branch, Padgett’s Creek, Isaac Creek, Johns Creek, and Sparks Creek. These grab samples were obtained by dipping new 50mL polypropylene (PP) tubes into the stream channel. Care was taken to sample upstream of any disturbance caused by entering stream channel. Three tubes were filled at each sampling location and returned to the lab for filtration and analysis. Beginning in 2015, pH and conductivity were measured directly when collecting samples. In the lab, the 3 tubes from each sampling location were composited for vacuum filtration using Whatman Nuclepore 0.4 um polycarbonate membranes. The filtered sample was divided into 3 new PP tubes and stored at 4C prior to analysis. To analyze: 1) Dispense 20mLs of sample into glass tube; 2) Allow sample to reach equilibrium with room temp; 3) Calibrate temperature correction on YSI Model 32 Conductance Meter using 0.0001N, 0.0005N, and 0.001N KCl; 4) Immerse conductivity cell into sample, and swirl to eliminate air pockets; 5) Check range and temperature correction for each sample, adjust if necessary; 6) Allow reading to stabilize, record result in uS after stable for 30 sec; 7) Remove cell, place stir bar in tube, place tube on stir plate and mix for at least 15 minutes to allow sample to reach equilibrium with atmospheric CO2; 8) After calibrating pH meter (Brinkmann Model Phi 360) on pH 4 and 7 buffers, immerse pH electrode; 9) Reading may take several minutes to stabilize; 10) Record pH when change in value is less than 0.02 units on successive readings; 11) While continuously stirring, place titrator (Metrohm Model 665 Dosimat) dispensing tip in tube; 12) End of tip should align with bulb of electrode without touching; 13) Dispense titrant (0.005N HCl) until pH 5.00, 4.5, and 4.2 are reached; 14) Record volume when endpoint is stable for 15 sec; 15) Convert volume to meq/L alkalinity. 16) Measure Anions and cations of filtered samples by ion chromatography (IC) and inductively coupled mass spectrometry (ICP). 17) Measure TOC/TN by TOC-V CSH/CSN (Shimadzu).
Date Range Comments: monthly

本数据集收录了自2014年7月至2018年12月期间，在提格河和恩里河流域，包括霍尔科姆支流、帕杰特溪、艾萨克溪、约翰溪和斯帕克斯溪等流域内，每月采集的河流水化学样本数据。这些抓取样本是通过将新的50毫升聚丙烯（PP）管浸入河槽中获得的。在采样过程中，特别注意在进入河槽前上游无任何扰动的情况。每个采样点填充三个管子，并送回实验室进行过滤和分析。自2015年起，在收集样本时直接测量pH值和电导率。在实验室中，每个采样点的三个管子合并后，使用Whatman Nuclepore 0.4微米聚碳酸酯膜进行真空过滤。过滤后的样本分为三个新的PP管，并在分析前储存于4摄氏度。分析步骤如下：1）将20毫升样本倒入玻璃管中；2）让样本与室温达到平衡；3）使用0.0001N、0.0005N和0.001N的KCl对YSI型号32电导率计进行温度校正；4）将电导池浸入样本中，轻轻摇动以消除气泡；5）检查每个样本的范围和温度校正，如有必要进行调整；6）在稳定30秒后记录结果，单位为微西门子；7）取出电导池，放入搅拌棒，将管子置于搅拌器上搅拌至少15分钟，以使样本与大气二氧化碳达到平衡；8）在pH值为4和7的缓冲液中校准Brinkmann型号Phi 360的pH计后，浸入pH电极；9）读数可能需要几分钟才能稳定；10）当连续读数的变化小于0.02单位时记录pH值；11）在持续搅拌的同时，将滴定仪（Metrohm型号665 Dosimat）的滴定头放入管中；12）滴定头的末端应与电极的球部对齐，但不得接触；13）滴定剂（0.005N HCl）直到pH值达到5.00、4.5和4.2；14）当终点稳定15秒后记录体积；15）将体积转换为毫当量/升的碱度；16）通过离子色谱（IC）和电感耦合等离子体质谱（ICP）测量过滤样品的阴离子和阳离子；17）使用TOC-V CSH/CSN（Shimadzu）测量总有机碳（TOC）和总氮（TN）。日期范围注释：每月。