Task: Error-Detect (source dataset: Spreadsheet-Tables)

Task: 
You are given a column of data from a table. Your job is to examine each value in the column, and identify if there is any clear data error in the column. An data error in the context of the column, can be values that are misspelled (typos), values that are formatted incorrectly, or values that are semantically incompatible with the rest of the column, etc., such that we can determine without ambiguity that such values are errors in the column. 

Since real-world data can vary widely in meaning and format, if you are uncertain whether a value is an error, please do not mark it as one. Only flag a value if you are confident that it is clearly a data error.

No explanation and return the final answer as a JSON object, {"obvious_error": "<CELL>"}. If you detect no error in the data, return {"obvious_error": null}.

Column:
| Unnamed: 0                                                                                                 |
|:-----------------------------------------------------------------------------------------------------------|
| from municipal water plant                                                                                 |
| from recycled flowback water of another well                                                               |
| sand used during fracturing (silica, quarts sand)                                                          |
| additives                                                                                                  |
| acid: hydrochloric acid or muriatic acid                                                                   |
| friction reducer: petroleum distillate                                                                     |
| surfactant: isopropanol                                                                                    |
| geling agent; guar gum or hydroxyethyl cellulose                                                           |
| scale inhibitor: ethylene glycol                                                                           |
| ph adjusting agent: sodium bicarbonate and sodium potassium hydroxide                                      |
| breaker: ammonium persulfate                                                                               |
| crosslinker: borate salts                                                                                  |
| iron control: citric acid                                                                                  |
| bactericide/biocide: glutaraldehyde                                                                        |
| corrosion inhibitor: formamide                                                                             |
| amount of flowback water                                                                                   |
| flowback water disposal                                                                                    |
| fractions                                                                                                  |
| recycled                                                                                                   |
| disposal in deep well injection class ii well                                                              |
| disposal in waste water treatment plant (sewage)                                                           |
| disposal in proper industrial treatment plants                                                             |
| energy consumption                                                                                         |
| reprocessing flowback water before recycling                                                               |
| deep well injection                                                                                        |
| treatment in waste water plant                                                                             |
| industrial treatment                                                                                       |
| emission due to the treatment process of flowback water before recycling                                   |
| emission due to diesel engine used during deep well injection of flowback water                            |
| emission due to  discharge of flowback water to surface water waste water treatment plant                  |
| acidity                                                                                                    |
| ammonia nitrogen                                                                                           |
| biochemical oxigen demand (bod)                                                                            |
| bromide                                                                                                    |
| chemical oxygen demand (cod)                                                                               |
| chloride                                                                                                   |
| dissolved organic carbon                                                                                   |
| hardness as ca co3                                                                                         |
| nitrate-nitrite                                                                                            |
| nitrite as n                                                                                               |
| oil and grease (hem)                                                                                       |
| specific conductance                                                                                       |
| sulfate                                                                                                    |
| total organic carbon toc                                                                                   |
| total alkalinity                                                                                           |
| total dissolved solid                                                                                      |
| total kjeldahl nitrogen                                                                                    |
| total phosphorus                                                                                           |
| total suspended solids                                                                                     |
| ph                                                                                                         |
| total recoverable phenolics                                                                                |
| sulfite                                                                                                    |
| methylene blue active substances (mbas) (mol. wt 320)                                                      |
| aluminium                                                                                                  |
| barium                                                                                                     |
| barium-diss                                                                                                |
| boron                                                                                                      |
| boron diss                                                                                                 |
| calcium                                                                                                    |
| calcium-diss                                                                                               |
| iron                                                                                                       |
| iron-diss                                                                                                  |
| lithium                                                                                                    |
| lithium-diss                                                                                               |
| magnesium                                                                                                  |
| magnesium-diss                                                                                             |
| manganese                                                                                                  |
| manganes-diss                                                                                              |
| potassium                                                                                                  |
| potassium-diss                                                                                             |
| sodium                                                                                                     |
| sodium -diss                                                                                               |
| strontium                                                                                                  |
| strontium-diss                                                                                             |
| zinc                                                                                                       |
| zinc-diss                                                                                                  |
| 1,2,4,-trimethylbenzene                                                                                    |
| 1,3,5-trimethylbenzene                                                                                     |
| acetone                                                                                                    |
| benzene                                                                                                    |
| naphtalene                                                                                                 |
| toluene                                                                                                    |
| xylenes (total)                                                                                            |
| 3-methylphenolmand 4-methylphenol                                                                          |
| acetophenone                                                                                               |
| bis(2-ethylhexyl) phtalate                                                                                 |
| diethyk phtalate                                                                                           |
| di-n-butyl phtalate                                                                                        |
| pyridine                                                                                                   |
| methanol                                                                                                   |
| volatile acid                                                                                              |
| emission due to proper industrial flowback treatment                                                       |
| energy requirements for pumping the  hydraulic fracturing fluids in the well                               |
| diesel                                                                                                     |
| emissions for pumping the  hydraulic fracturing fluids in the well                                         |
| co2                                                                                                        |
| so2                                                                                                        |
| nox                                                                                                        |
| pm                                                                                                         |
| co                                                                                                         |
| nmvoc                                                                                                      |
| difference of materials used between conventional drilling and horizontal drilling                         |
| steel                                                                                                      |
| portland cement                                                                                            |
| gilsonite (asphaltite)                                                                                     |
| diesel fuel                                                                                                |
| bentonite                                                                                                  |
| soda ash                                                                                                   |
| gelex                                                                                                      |
| polypac                                                                                                    |
| xanthum gum                                                                                                |
| water throughput ( water volumes do not account for water associated with hydraulic fracturing activities) |
| surplus of emission due to wells horizontal drilling                                                       |
| well completion- potential emissions due to well completion without flaring or rec conventional wells      |
| ch4                                                                                                        |
| c2h6                                                                                                       |
| c3h8                                                                                                       |
| n2                                                                                                         |
| well workovers- potential emissions due to well completion without flaring or rec conventional wells       |
| well completion- emission due to well completion including flaring or rec conventional wells               |
| well workovers- emission due to well completion including flaring or rec conventional wells                |