Why sometimes TDS got exceeded to TS and gives negative results during analysis of wastewater?

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Gaurav H Tandon

Human activities such as agriculture, water use, industry processes and mining can increase the TDS level in waterbody.

I’m not sure that a negative value for TS is even possible. Theoretically and philosophically, it doesn’t seem like it would be.

Total Solids= Total Suspended Solids (TSS) + Total Dissolved Solids(TDS)

Kevin Djatsa Nguedia

How are the two parameters related? TDS deals with dissolved mineral constituents in wastewater, whereas TS deals with suspended solids in wastewater. TDS is mainly related to conductivity.

B Guru Prasad

Total Solids are due to suspended and dissolved solids. Suspended solids is not chemically bonded by the water molecules. However, Dissolved solids is chemically bonded with water molecule. Probably this could be the reason for TDS got exceeded to TS and gives negative results.

Luis Fuentes

I think that it may be something related to a bad handling of the sample, since it is not possible that they give negative results when the TS are the sum of the TDS and TSS. Consult part 2 of SMWW 2540A where it talks about possible errors.

Sunita Kesar

Thank you Luis Fuenton for responding..Actually I was talking about..TSS=TS-TDS, where sometimes TDS got increased than the TS.. and the sample handling was also done carefully..

Thank you.. @Gaurav H Tandon

Thank [email protected]'s related with TSS...such as TSS=TS-TDS

Thank you @B Guru Prasad...for answering..

Samsul Islam

In some cases, Total Dissolved Solids (TDS) can exceed Total Suspended Solids (TSS) in wastewater analysis, leading to negative results. This situation can occur due to several factors:

Evaporation during Sample Storage: If the wastewater sample is not properly stored and sealed, evaporation of water can occur over time, leading to an increase in the concentration of dissolved solids. This can cause TDS to exceed TSS in the remaining sample.

Dissolution of Suspended Solids: During the sample collection and storage process, some of the suspended solids may dissolve in the water, contributing to the TDS measurement.

Sample Dilution: If the wastewater sample is diluted accidentally or intentionally during the analysis process, the concentration of suspended solids may be reduced, causing TDS to become greater than TSS.

Analytical Errors: Errors in the measurement of TDS and TSS can also contribute to negative results. These errors may occur during the sample preparation, handling, or analysis stages.

Volatile Solids: Some solids in the wastewater may be volatile and can evaporate during the analysis process. This can lead to an overestimation of TDS and result in negative TSS values.

To avoid these issues and ensure accurate results during wastewater analysis, it is essential to follow proper sample collection, storage, and handling procedures. Additionally, using appropriate analytical methods and equipment can help minimize errors and ensure reliable measurements of TDS and TSS. If negative results are obtained, it is crucial to carefully review the analytical process and consider factors that may have contributed to the discrepancies. If necessary, repeat analyses or use alternative methods to obtain accurate and meaningful results.

Thank you for answering...Samuel