[0023]  Each of the compounds above includes a hydroxyl  group present on a carbon chain suggesting a pKa compa› rable to that of ethanol. The inventors have observed that  such compounds, whether used as a surfactant on their own,  or present as an impurity or other component in a surfactant  or other component of the composition, leads to instability  of a halosulfuron-methyl composition containing such com› pound or compounds.  [0024]  The following table shows seven compositions  where the amount of halosulfuron-methyl lost was greater  than 5% of the pesticide after storing the liquid composition  for 8 weeks at 40°  C. in a sealed container.  67-3 (Silwet L-77) with unacceptable hydroxy functionality;  (5)  contains unacceptable hydroxy-termination of the  alkoxylate; (6) contains unacceptable hydroxy-termination  from polyethylene glycol synthesis; and (7) contains unac› ceptable hydroxy-termination from polyethylene glycol syn› thesis. The inventive compositions described herein lack  such alcohols in any of the components, particularly the  surfactant where such alcohols are a common feature or are  present as a result of the manufacturing process, or incom› plete purification. These alcohol-containing compounds  need to be removed or avoided in order to achieve a stable  halosulfuron-methyl composition.  [0025]  To test stability, the compositions were sealed in a  container and stored for 8 weeks at 40°  C. The relative  percentage loss ofhalosulfuron-methyl was calculated using  high performance liquid chromatography (HPLC). The  samples were extracted with solvents and then analyzed with  reverse phase HPLC equipped with UV detector. The  response from the detector are peak areas (mAu*s). The  peak areas were correlated with percentage active ingredi› ents through a standard calibration curve. The percentage of  pesticide was calculated through the calibration curve.  Chemically stable compositions are those compositions that  had less than 5% (w/w) relative loss ofhalosulfuron-methyl  after 8 weeks of storage at 40°  C.  [0026]  The seven compositions ( described above) that  failed can be described as follows: (1) contains unacceptable  alcoholic-hydroxy; (2) contains unacceptable hydroxy-ter› mination from polyethylene glycol synthesis; (3) contains  unacceptable alcoholic-hydroxy; ( 4) contains CAS #67674- [0027]  The present inventors have found that molecules  having instability-producing OH groups even if present in  small quantities can render the entire composition unstable.  For example, the composition Silwet L-77 (siloxane poly› alkyleneoxide copolymer, >50% methyl-terminated) leads  to instability. In theory, methyl-terminated siloxanes should  not have instability producing OH groups. However, the  inventors have found that methyl-terminated siloxanes con› tain some OH-terminated siloxane molecules. Even if pres› ent in small amounts, the OH-terminated siloxanes result in  instability of the overall composition.  [0028]  The instability producing OH groups lead to insta› bility regardless of whether they are a minor component in  a much larger molecule. For example, the inventors have  observed  instability  for  polyethylene  glycol  8000  (PEG8000) even though the entire 8000 MW polymer has  only a single instability producing OH group. In addition,  PEG and polypropylene glycol (PPG) are known impurities  *This composition was not tested for the full eight weeks due to physical instability.  US 2020/0260722 Al  5  Aug. 20, 2020  "Rlv1" stands for rheology modifier.  Unstable Halosulfuron-Metbyl Compositions  Diluent  Caprol PGE 860  (liquid)  (1,2,3- Stepan 108  Propanetriol,  Halosulfuron- RADIA 7118  (>90% caprylic/  homopolymer,  metbyl  (>95% Metbyl  capric  (9Z)-9- (purity 99%)  Laurate)  triglyceride)  octadecenoate)  13.6  2  12.5  3  15.0  85.0  4  5.0  90.0  5  5.0  90.0  6*  20.0  69.0  7  20.0  69.0  Surfactant  SOPROPHORfi  TSP 724  (alkoxylated  Hypermer B210  polyaryl  STEPFAC  (ABA block  phenol, >99%)  8181  copolymer)  2  3  4  5  5.0  6*  5.0  2.0  7  Surfactant  Silwet L-77  (siloxane  Polyaldo  polyalkyleneoxide  PEG 8000  3-1-S  copolymer,  (Polyethylene  (Polyglyceryl-3  >50% metbyl- glycol)  stearate)  terminated)  86.4  87.5  5.0  Cirrasol G 1086  NV-LQ-AP  RM  Altox  (polyoxyetbylene  Hi-Sil T600  Metasperse  (40) sorbitol  (silica,  550 S-PW(WD)  hexaoleate)  amorphous)  4.0  2.0  5.0  4.0 