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首页> 外文期刊>Estuarine Coastal and Shelf Science >Correction for particulate organic matter as estimated by loss on ignition in estuarine ecosystems
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Correction for particulate organic matter as estimated by loss on ignition in estuarine ecosystems

机译：通过河口生态系统中燃烧损失估算的颗粒有机物的校正

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Loss on ignition (LOI) is a simple, inexpensive method widely used to estimate organic matter in the water column and sediment of marine and freshwater ecosystems. Suspended particulate matter in estuarine waters however often contains a large fraction of argillaceous minerals whose loss of structural water can introduce significant bias to the method. The accuracy of LOI, in comparison with elemental analysis, was evaluated in 105 water samples from the Marennes-Oleron Bay (French Atlantic coast). The suspended particulate matter analysed ranged from 7 to 108 mg l~(-1), with a mean inorganic fraction of 81.3 +- s.d. 7.2%. LOI overestimated particulate organic matter (POM) concentrations by up to 300% (mean 98 +- s.d. 28%), and this overestimation was significantly related to particulate inorganic matter (PIM) concentrations. POM overestimation increased linearly with PIM, representing a mean 8.7 +- s.d. 2.0% of PIM. This value was compared with a theoretical correction factor based on the specific clay composition of PIM at the study site and on thermo-gravimetric analysis for standard clay. The clay fraction, which represents 90% of PIM in the Marennes-Oleron Sound, consists of 40% illite, 30% kaolinite and 30% montmorillonite. The similarity between the theoretical correction factor (9.3% of PIM) and the overestimation based on measurements (8.7%), suggests that a priori correction of POM data is possible. In fact, for three bodies of water along the French Atlantic coast, whose inorganic resuspended matter shows the same mineralogical composition, POM concentrations as estimated by LOI can be corrected by subtracting 9.3% of PIM mass.
机译：灼烧损失（LOI）是一种简单，廉价的方法，广泛用于估算海洋和淡水生态系统的水柱和沉积物中的有机物。然而，河口水中的悬浮颗粒物通常含有很大一部分的泥质矿物，其结构水的损失会给该方法带来明显的偏差。与元素分析相比，在来自Marennes-Oleron湾（法国大西洋海岸）的105个水样中评估了LOI的准确性。分析的悬浮颗粒物范围为7至108 mg l·（-1），平均无机分数为81.3±s.d。 7.2％。 LOI高估了颗粒有机物（POM）的浓度高达300％（平均98±s.d. 28％），这种高估与颗粒无机物（PIM）的浓度显着相关。 POM的高估随PIM线性增加，平均为8.7±s.d。 PIM的2.0％。将该值与基于研究现场PIM的特定粘土成分和标准粘土的热重分析得出的理论校正因子进行比较。粘土成分占Marennes-Oleron海湾PIM的90％，由40％伊利石，30％高岭石和30％蒙脱石组成。理论校正因子（PIM的9.3％）和基于测量的高估（8.7％）之间的相似性表明，对POM数据进行先验校正是可能的。实际上，对于法国大西洋沿岸的三个水域，其无机重悬物显示出相同的矿物学组成，用LOI估算的POM浓度可通过减去9.3％的PIM质量来校正。

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